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> Boosting a 1.7, Can it be done, or would I be wasting my time?
nein14
post Oct 10 2006, 07:42 AM
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You guys forgot about the Evil Ed's car started life as a 1.7 Turbo then went to 2.0 9 lbs boost on the street. Get a copy of Excellence June 02' four page article. (IMG:style_emoticons/default/aktion035.gif)
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DNHunt
post Oct 10 2006, 07:50 AM
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QUOTE(airsix @ Oct 9 2006, 10:52 PM) *

Who's Airsix? I thought that guy died or something. (IMG:style_emoticons/default/confused24.gif)


This is getting spooky. So close to Halloween and old nonmembers returning to post.

Stick around for a while so we know you are real.

Dave
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Bleyseng
post Oct 10 2006, 08:05 AM
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QUOTE(Jeff73 @ Oct 8 2006, 11:54 AM) *

So, what would my expected hp output be if I did a cam swap on my 1.7? Also, what would a 2.0 cost me, and a rebuild for it if needed? Thanks for all the help, just trying to think of my options.

A cam change will help but the heads with the small 39x34 valves need to be 42x36.
With a few mods, 100hp is close.
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ottox914
post Oct 10 2006, 08:39 AM
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Here is a link to my SDS install. I'll be adding some "un-natural" aspiration to my car this winter, and will include photos and the story of fabrication. I'm planning a simple flange adaptor to add the turbo to the back of the kerry hunter header already on the car. This puts the turbo about in line with the back of the trans, so I can use the trans mounting points where the factory brace goes to hold up the exhaust to support a bracket to the turbo. This will also require a scavange pump to return the oil to the engine. An external oil cooler is also in the plans. A straight pipe out the back of the turbo to the stock lower valance notch leaves lots of room where the muffler was to mount turbo, oil cooler, scavange pump. The turbo charge line will run up the driver side, over the axel, and enter the engine compartment at the back tin. Still debating using an auqamist water inter-cooling system I have leftover from another turbo project, or mounting a suby wrx intercooler under a GT lid, or both. I'd like to see a reliable 10psi, but would be happy with 6-8 without melting anything.

http://www.914world.com/bbs2/index.php?show...c=53733&hl=
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Jake Raby
post Oct 10 2006, 09:09 AM
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The limits I have found on stock pistons is 8 PSI... After that the top ring land is toast really quick if you sustain the boost for more than 3-4 seconds.. When i have added water injection the limits have stayed about the same.

By far the best stock engine to Turbo has the 90mm bore size.. This year of purposely broken parts has taught me a ton about the limits of stock TIV engines under boost and when things start to break. I have a Turbo specific forum on my new forums that open on November 1 and I'll be sharing a lot of these findings there.
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Mueller
post Oct 10 2006, 06:52 PM
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QUOTE(Jake Raby @ Oct 10 2006, 08:09 AM) *

The limits I have found on stock pistons is 8 PSI... After that the top ring land is toast really quick if you sustain the boost for more than 3-4 seconds.. When i have added water injection the limits have stayed about the same.

By far the best stock engine to Turbo has the 90mm bore size.. This year of purposely broken parts has taught me a ton about the limits of stock TIV engines under boost and when things start to break. I have a Turbo specific forum on my new forums that open on November 1 and I'll be sharing a lot of these findings there.



Jake, would the addition of piston oil squirters help?? by the way, there is a 914 race car for sale with a "Jake Raby" motor in it in Panorama (IMG:style_emoticons/default/driving.gif)
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Jake Raby
post Oct 11 2006, 06:33 AM
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Hmmn, wonder if it's a real "Jake engine"..Lots of fakes out there these days..

If the car is in the 407 area code it's real- it is the only 914 that I know of for sale with my engine and it's an FP 914 for SCCA
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PORobinSCHE
post Oct 14 2006, 02:01 PM
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okay a stock 1.7L is 90x66 what bore is needed to go to 1911c.c.? also, does the block have to be machined?

thanks

R
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Aaron Cox
post Oct 14 2006, 02:09 PM
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66 stroke by 96 bore = 1911
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Mueller
post Oct 14 2006, 03:49 PM
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QUOTE(PORobinSCHE @ Oct 14 2006, 01:01 PM) *

okay a stock 1.7L is 90x66 what bore is needed to go to 1911c.c.? also, does the block have to be machined?

thanks

R


no block machining, but the heads will need to be opened up a bit, cost should be like $50 from Rimco
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Bleyseng
post Oct 14 2006, 04:05 PM
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kinda of a waste to just open the head registers as the valves and ports are small.

find a set of 1.8L heads that are good and use those- bigger valves stock! 96's fit fine
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JPB
post Oct 14 2006, 04:19 PM
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QUOTE(ottox914 @ Oct 10 2006, 10:39 AM) *

I'm planning a simple flange adaptor to add the turbo to the back of the kerry hunter header already on the car.

http://www.914world.com/bbs2/index.php?show...c=53733&hl=


Funny, I was thinking just that yesterday since it is a convenient place for a turbo.

(IMG:style_emoticons/default/beer.gif) Are you all thinking of using the stock FI cam with the turbo setup and SDS FI?
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Sammy
post Oct 14 2006, 04:45 PM
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I know I've posting this many time before but it bears repeating:

YOU CAN TURBO ANY INTERNAL COMBUSTION ENGINE!

The only difference is how much boost you can safely develop.

A completely stock 1.7 can handle up to 7 psi boost as long as you run it a bit rich on the top end and don't advance your timing too far. That should be good for a lot more horsepower than any bolt ons would ever give you, and at least as much as a $6000 high performance engine modification kit will give you.

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ottox914
post Oct 14 2006, 09:45 PM
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QUOTE(JPB @ Oct 14 2006, 02:19 PM) *

QUOTE(ottox914 @ Oct 10 2006, 10:39 AM) *

I'm planning a simple flange adaptor to add the turbo to the back of the kerry hunter header already on the car.

http://www.914world.com/bbs2/index.php?show...c=53733&hl=


Funny, I was thinking just that yesterday since it is a convenient place for a turbo.

(IMG:style_emoticons/default/beer.gif) Are you all thinking of using the stock FI cam with the turbo setup and SDS FI?


Yup.

Progress on the turbo will depend on how far I get with the tuning of the engine sans-turbo this fall. I'd like to have the engine maybe 95% good, across all MAP and RPM ranges before boosting. Some may call me a little chicken, to just go for it, I like to think of this as being a well thought out, tested install. If snow flys early, and I'm not completly comfortable with the n/a tune, I may fab up all the parts, but not bolt it in till I'm sure the n/a tune is under control.

I did a turbo focus a couple yrs ago. The word on that was it couldn't be done reliably. To much compression and a timing happy ecu. At around 30k miles the turbo went on, sold the car at 66k, it now has 135k on it and still suprizes the ricers. Do your research, set reasonable goals, and boost happily ever after.

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Sammy
post Oct 14 2006, 11:30 PM
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Oh, I almost forgot. you can't turbo a 914 (IMG:style_emoticons/default/wink.gif)
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