 Need Horsepower |
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| malaga_red75 |
 Mar 6 2006, 12:01 AM
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#1
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'74 2.5L N/A Subie  Group: Members Posts: 454 Joined: 5-March 06 From: Menlo Park, CA Member No.: 5,674 Region Association: None  |
Hey guys. This is my first post and I was hoping some of you guys could help me out. I have a 75 1.8 914 and obvoiusly with only 73 hp, I could use some more. I was wondering what things i could do to get some more horses out of it. I would prefer not to do a conversion as I am on a budget, but any ideas would be great!
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| anthony |
Mar 6 2006, 01:16 AM
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#2
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2270 club Group: Benefactors Posts: 3,107 Joined: 1-February 03 From: SF Bay Area, CA Member No.: 218  |
Unfortunately, there isn't much you can really do. (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif)
The cheapest thing is a free flowing exhuast. Heat exchangers from a 73-74 2L engine and a new exhuast will free up some hp. Mostly everything else requires tearing into the engine and bringing lots of money. |
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| alpha434 |
Mar 6 2006, 01:28 AM
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#3
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My member number is no coincidence. Group: Members Posts: 3,154 Joined: 16-December 05 From: Denver, CO Member No.: 5,280 Region Association: Rocky Mountains |
Someone told me that there where 25 different releases of the L-jet. And that The best version made a LOT more than 73 hp.
I'm stuck with a 75 L too. And I outrun 1.7s pretty easy. Played with a 2.0 once too. But he said that his car "wasn't working properly" when I nailed hi on a straight. I think I've got pics. One of our guys got arrested that day.... |
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| Mueller |
Mar 6 2006, 01:53 AM
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#4
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None 
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(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif) yep, Anthony is correct (and alpha is drinking his CNC coolant again, (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif) 25 different versions of L=jet for the 914??? (IMG:http://www.914world.com/bbs2/html/emoticons/screwy.gif) ) The biggest problem with backdating to the earlier exhaust is the chance to break or strip a head exhaust stud...very painful experiance and can get very expensive (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) (my last broken exhaust stud cost my wife $30K, of course I got a 911 out of the deal (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) ) Are you sure your car is running in tip top shape with a proper tune up? Any vac. leaks? I fab'd "plugs" to go into the air intake boot and ran a "puke" can for the crankcase vent., car ran great !!!! |
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| SirAndy |
Mar 6 2006, 02:16 AM
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#5
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Resident German Group: Admin Posts: 41,680 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
here's one more horse you can add ... (IMG:http://www.914world.com/bbs2/html/emoticons/dead horse.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif) with all the above (except alpha (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) ) ... better flowing headers + exhaust will help some. not much you can do on the intake side without braking the motor open ... what exactly do you mean by "I am on a budget"? throw us a number ... (IMG:http://www.914world.com/bbs2/html/emoticons/cool_shades.gif) Andy |
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| Brando |
Mar 6 2006, 02:35 AM
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#6
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BUY MY SPARE KIDNEY!!! Group: Members Posts: 3,935 Joined: 29-August 04 From: Santa Ana, CA Member No.: 2,648 Region Association: Southern California |
for less than $500 you can keep your stock injection and heads, throw some 96mm Pistons and Cylinders under there. a 1911 with L-Jet and some bumped compression should make an even 95 or 100 with the early 2.0 headers as mentioned. Go for SSIs and a bursch exhaust. Should keep you under a grand if you don't mind pulling the engine.
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| Bleyseng |
Mar 6 2006, 09:13 AM
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#7
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Maybe 90hp if you do a cam change too say the Raby 9950 with lifters. 96mm isn't gonna make 100hp or atleast I haven't ever seen a dyno sheet to make it a fact. The heads also limit the hp. So to make so hp on a 1.8l Switch to 96mm pistons and cylinders ( they are special ones to fit the 66mm stroke) Switch out the cam and lifters to a Raby 9550 cam with lifters ( oil temps will go down) |
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| alpha434 |
Mar 6 2006, 10:32 AM
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#8
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My member number is no coincidence. Group: Members Posts: 3,154 Joined: 16-December 05 From: Denver, CO Member No.: 5,280 Region Association: Rocky Mountains |
Ok then. Who here knows the cam specs for 1.8?
You can port and polish the heads too. That's a VERY cheap upgrade if you do it yourself. Real easy horsepower if you take out enough material. |
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| Bleyseng |
Mar 6 2006, 10:54 AM
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#9
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Thats not going to make much of a difference if you still are using the stock cam. Polishing the ports does jack as the injectors are pointing right at the valve. You can also destroy the heads pretty quickly if you do it yourself! Better Airflow is achieved by a BETTER cam as the stock cam is very mild (same as the Djet cam) and set up for quick warm ups and running fairly hot for emissons. The 1.8heads are ok valve size wise but the spark plug location is better on the 2.0l heads. Raise the compression ratio to 8 to one with the 96mm's |
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| anthony |
Mar 6 2006, 11:02 AM
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#10
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2270 club Group: Benefactors Posts: 3,107 Joined: 1-February 03 From: SF Bay Area, CA Member No.: 218 |
For me there are too many "while you are theres" in just fitting new P&Cs. And how much hp do you get out of 96mm P&Cs with no other changes? Like 5hp? 10hp max?
Once you tear it all down it will be a shame not to have the heads refreshed. You'll probably find cracks or strip a stud which will mean sending the heads out anyway. You'll probably find that you want a new clutch ($500). The flywheel may have seen better days ($300). DWD sets in and two years and $3,000 later you've powdercoated and polished the engine compartment and rebuilt half the engine for a 10hp improvement. :-) If I was going to put $1000 or $2000 into a 914-4 that was running good I'd first work on the suspension. With some good shocks (Konis or Bilsteins), a 19mm sway bar up front, 140lbs rear springs, and maybe turbo tie rods you will have a car that rides on rails. It may be underpowered but you can go fast in and out of turns. After that if you really want more hp I'd consider the following order: 1911 top end upgrade (96mm P&Cs) $1500 2056 kit $3000 2270 kit $5000 six conversion $6000-7000+ |
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| Bleyseng |
Mar 6 2006, 11:12 AM
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#11
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
find a good used 2.0l and drop it in, now thats the cheapest hp increase for about $800-1200
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| Cap'n Krusty |
Mar 6 2006, 11:13 AM
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#12
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
25? True, if you count the Jaguar XJ6, the 280/300 ZX, and a buncha other cars. They have more power. Of course, SOME of that power comes from larger displacement and stuff like that. The Cap'n |
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| Cap'n Krusty |
Mar 6 2006, 11:15 AM
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#13
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Jake will probably agree with me that we've seen a LOT of home port & polish jobs that actually resulted in LESS HP. The Cap'n |
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| Jake Raby |
Mar 6 2006, 11:25 AM
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#14
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The Capn is exactly right...
If you can't afford a professional (that knows ONLY TIV heads) leave the ports alone. Altering ports has the capability of altering port margins which can easily result in an engine that runs like crap, is untunable and rins hot. Do it right, or leave it alone. |
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| newto914s |
Mar 6 2006, 03:12 PM
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#15
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Senior Member Group: Members Posts: 561 Joined: 16-February 04 From: Thornton, CO Member No.: 1,663 |
(IMG:http://www.914world.com/bbs2/html/emoticons/hijacked.gif)
Bleyseng you've recommended the Raby 9950 Cam twice in two days. What's so special about this cam. Its identical to a stock D-jet cam right? I was always under the impression only a stock cam will work right with D-jet (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) OK, hijack over (IMG:http://www.914world.com/bbs2/html/emoticons/welcome.png) malaga_red75. My car was once Malaga Red too, and will be again one day. Post some pics of your car Samson |
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| bd1308 |
Mar 6 2006, 03:30 PM
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#16
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
No, the 9950 is a cam "optimized" and warmer than the stock cam IIRC.
b |
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| Andyrew |
Mar 6 2006, 03:37 PM
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#17
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Spooling.... Please wait Group: Members Posts: 13,376 Joined: 20-January 03 From: Riverbank, Ca Member No.: 172 Region Association: Northern California
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Um...
A turbo? Many guys do it on the cheap.. Do it for 500 bucks if you got the skills... Blow the engine? get another $500 engine! Repeat if neccisary! (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) |
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| Bleyseng |
Mar 6 2006, 04:54 PM
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#18
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Its a different grind that produces more hp and less oil temps. I think its upto Jake to state the grind specs online as its his produce. I will say I noticed a real seat of the pants difference from the stock cam as I just got my 2056 running again after replacing the cam in it. I also have installed one in the 1.7L engine that I am working on for Blairs 914. I finally got mine to idle right this weekend but that was due to other problems. Runs great with nice torque in the low revs and power seems to peak at 5000 rpms and revs easily to 6500. |
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| newto914s |
Mar 6 2006, 05:22 PM
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#19
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Senior Member Group: Members Posts: 561 Joined: 16-February 04 From: Thornton, CO Member No.: 1,663 |
So it's a cam that idles and runs smoothly with stock Fuel Injection, but gives you a little more power and cooler temps. Oh, and a few more revs. Sounds to good to be true (IMG:http://www.914world.com/bbs2/html/emoticons/idea.gif)
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| Jake Raby |
Mar 6 2006, 05:31 PM
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#20
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Whats special about the 9550 cam is that it was designed specifically for stock FI optimization for engines up to 2056cc. It has a very mild intake ramp and adds a bit of exhaust duration to balance out the equation and provide a broader power range. This cam is perhaps the most effective cam I have ever designed and it sells 6 times more than any of my other grinds! People have fallen in love with this cam profile. |
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