Dyno, done |
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Dyno, done |
J P Stein |
Apr 5 2008, 11:09 AM
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#1
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Broke in the motor on a chassis dyno yesterday. Did a couple of pulls after 30-40 minutes of run time. Not bad right out of the box. Conservative timing & rich on the AF.
Attached image(s) |
Heeltoe914 |
Apr 5 2008, 11:59 AM
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#2
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Senior Member Group: Members Posts: 1,135 Joined: 31-January 06 From: Tujunga Calif, Member No.: 5,506 |
Thanks for posting But its to small to read?
What motor? What HP what Tq? Is this what you where after when you built the motor? |
J P Stein |
Apr 5 2008, 03:05 PM
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#3
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Hard to read, but I can see it......trifocals, ya know. (IMG:style_emoticons/default/biggrin.gif)
198 hp, 190 ft lbs A 2.7L 9eleben motor. Sure, I'm happy with it...nuthin' broke. I'm gonna have to re-jet the mains as the AF ratio is 11.9 to 13.0 and pretty flat at 12.5ish above 4200 rpms. |
degreeoff |
Apr 5 2008, 10:29 PM
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#4
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I like big butts and I can not lie! Group: Members Posts: 1,622 Joined: 9-February 03 From: Booowieeee MD (near DC) Member No.: 275 Region Association: MidAtlantic Region |
I'd love to know what you have there,,,twin plug? cam, port sizes, comp ratio, induction.....
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J P Stein |
Apr 5 2008, 11:02 PM
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#5
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Single plug, 10.5:1 Mahles (race gas), Solex cams, 36mm intakes,35 exh, Webers on the tall manifolds....nuthin' trick. The cam is really good for AX.
The trans is also set up for AX. Attached thumbnail(s) |
drew365 |
Apr 6 2008, 12:44 PM
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#6
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These are the good old days! Group: Members Posts: 2,004 Joined: 29-December 02 From: Sunny So. Cal. Member No.: 37 |
That's great TQ. I havn't dyno'd mine since the last rebuild. Prior to that, on pump gas it was 197 hp, 165 tq.
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J P Stein |
Apr 6 2008, 02:21 PM
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#7
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Thanks, Andy.
It's built with torque in mind. The torque multipliers : The compression, tall aux venturi, balance tube type muffler, the cams......every little bit helps, me thinks. Peaky motors sux at AX unless you have one of them light switch transmissions. The hp just comes with the package and I like that too. (IMG:style_emoticons/default/biggrin.gif) I think there is more to be had with some fine tuning. |
degreeoff |
Apr 6 2008, 08:34 PM
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#8
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I like big butts and I can not lie! Group: Members Posts: 1,622 Joined: 9-February 03 From: Booowieeee MD (near DC) Member No.: 275 Region Association: MidAtlantic Region |
Sweet man...Gives me hope as my GE40 cams seem a bit more radical than yours and I am running the 9.8:1 pistons with the mac daddy crank fire so.......I should be right about where you are!
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J P Stein |
Apr 6 2008, 10:21 PM
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#9
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Sweet man...Gives me hope as my GE40 cams seem a bit more radical than yours and I am running the 9.8:1 pistons with the mac daddy crank fire so.......I should be right about where you are! Ayup, your peak power should be right in there, maybe better. As I said, mine is built for mid range rather than top end. Radical cams have their advantages and downsides. I run a NOS 74 Euro Carrera dizzy & an MSD set up for ignition. |
Downunderman |
Apr 6 2008, 11:42 PM
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#10
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Senior Member Group: Members Posts: 852 Joined: 31-May 03 From: Sydney, Australia Member No.: 766 Region Association: Australia and New Zealand |
JP,
Which bit of the A/F don't you like? 12.5 above 4k all the way to the top is pretty close to the money, and probably too hard to improve on. The graph is a bit hard to read even with multifocals. H |
byndbad914 |
Apr 7 2008, 12:16 AM
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#11
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shoehorn and some butter - it fits Group: Members Posts: 1,547 Joined: 23-January 06 From: Broomfield, CO Member No.: 5,463 Region Association: None |
JP, Which bit of the A/F don't you like? 12.5 above 4k all the way to the top is pretty close to the money, and probably too hard to improve on. The graph is a bit hard to read even with multifocals. H (IMG:style_emoticons/default/agree.gif) was going to ask the same question - 12.5 is EXACTLY what I shoot for on the dyno. In fact, I took my car to the chassis dyno after I moved to a mile high from sea level and re-jetted based on altitude conversions. I was stoked to see 12.5 all thru the pulls and didn't touch the jetting because of it. |
J P Stein |
Apr 7 2008, 07:13 AM
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#12
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Thanks for the input, guys.
I'm new to race gas so I'm a bit up in the air on this. It now blows black soot out the exhaust when you gas it and pops out the pipes on the over run. I haven't looked at the plugs as yet so I'm not doing anything for now. |
URY914 |
Apr 7 2008, 10:40 AM
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#13
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,426 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
So what do ya think you'll get from it when it's all dailed in, 215?
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J P Stein |
Apr 7 2008, 10:58 AM
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#14
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
I don't put a lot of faith in chassis dyno numbers except for comparison. The dyno guy said the driveline losses are between 10 & 15 %.
I'll do some foolin' with it and prolly never go back to the dyno.....so (IMG:style_emoticons/default/confused24.gif) One thing I'm thinkin is the octane may be too high for the compression. Something to fool with. |
Joe Ricard |
Apr 8 2008, 03:48 PM
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#15
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
what octane is your race gas.
Takes a mighty plug to get it lit and a coil with multi-spark discharge. |
J P Stein |
Apr 8 2008, 06:00 PM
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#16
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
what octane is your race gas. Takes a mighty plug to get it lit and a coil with multi-spark discharge. VP 101, which, IIRC, is 99 octane. Maybe when I get a bit older & start forgettin' stuff, you can tell me stuff I tole you. (IMG:style_emoticons/default/biggrin.gif) |
Joe Ricard |
Apr 9 2008, 05:52 AM
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#17
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
what octane is your race gas. Takes a mighty plug to get it lit and a coil with multi-spark discharge. VP 101, which, IIRC, is 99 octane. Maybe when I get a bit older & start forgettin' stuff, you can tell me stuff I tole you. (IMG:style_emoticons/default/biggrin.gif) I got all that stuff you tole me stashed away for safe keeping. Howz come you never tole me how to drive faster????? (IMG:style_emoticons/default/blink.gif) (IMG:style_emoticons/default/laugh.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/poke.gif) |
J P Stein |
Apr 9 2008, 06:42 AM
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#18
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Iff'n I knowed how, I'd tell ya. (IMG:style_emoticons/default/confused24.gif)
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