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who has recent dyno test stats?
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CÚdric  



Joined: 27 Aug 2004
Posts: 1985
Location: Sweden

PostPosted: Thu May 30, 2013 4:06 pm    Post subject: Reply with quote

Nice with some dyno graphs! Did you run on rollers? Do you have the same graphs with whp? How do you know you are low on hp? did you run before and after? Otherwise there is just to much guessing to conclude anything

What AFRs did you run? Do you have a curve on that to?
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9xx  



Joined: 18 Jun 2006
Posts: 627
Location: Jarvenpaa, Finland

PostPosted: Thu May 30, 2013 7:22 pm    Post subject: Reply with quote

Yes it was run on rollers, no whp graph but I got the other datasheet now. Looks like it is almost too rich mixture? There was no before IC and after IC runs, just this one. But the question is that did the IC actually do anything beneficial, after all it got quite warm. Would the result have been the same with stock charge tube? But on general level I don't think it is low on power. Torque is for example on Carrera GT level, 276 Nm. Of course boost pressure is slightly higher too.


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All gone: 931 '82 Alpine White, original option "220" G31 with LSD + 3 x 944
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1983
Location: Somerset, UK

PostPosted: Thu May 30, 2013 11:08 pm    Post subject: Reply with quote

Actual numbers for my latest modifications and running just 0.7 bar boost

180whp (est 210.4 hp at the flywheel) at 4829 rpm which is when we came off the gas
198.09ft/lbs torques (est 229.47 at the flywheel) at 4278 rpm. Of which this figure was fairly flat from 3500-4829rpm when we shut down

This is still with the restrictive K&N air filter and not the larger ITG which will be fitted in due course. This is hitting an AFR of circa 10.x at WOT which is too rich, but safe. Timing was set at 8.7deg at idle. CGT spec turbo, Piper 270 cam, forged pistons at 8.2:1 CR, 951 FMIC, modified intake manifold and S2 TB. Running stock S1 CIS and ignition.

I am happy as I thought it would be circa 200 bhp at 0.7 bar. Sense prevailed today in not pushing it too hard to soon on the rollers. Now its running its best to take baby steps to getting the bigger numbers and getting the set up right first. Next step is to modify the WUR to be adjustable and remap the advance/retard curve by having the dizzy rebuilt.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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CÚdric  



Joined: 27 Aug 2004
Posts: 1985
Location: Sweden

PostPosted: Fri May 31, 2013 3:31 pm    Post subject: Reply with quote

You have to be reeeeally careful in comparing roller dyno HP (especially guessed engine HP) numbers with factory numbers. There is so many factors in between that you cant really say anything accurate, its more of guidelines. And comparing one roller dyno setup with another one should be taken carefully. But I think it could be quite reasonable numbers, maybe lean out the AFR slightly will give you more HP, but the extra knock margin is also nice. Mine runs pretty flat AFR wise from 4k rpm to redline, just some very small fluctuations bewteeen 11.1 and 11.3, it an s2 engine at 0.7bar with s1 2664 compressor .

The FMIC would probably be much better than TMIC at very low coolant air flow, so that will likely affect you results a lot.

Would be really nice if you had some log data on a full acceleration run, that would be a great comparison. I have some full throttle logs that I did down an airfield. Would be nice to see the actual in gear performance changes with your upgrades !
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1983
Location: Somerset, UK

PostPosted: Fri May 31, 2013 5:50 pm    Post subject: Reply with quote

Cedric, I appreciate your watch out on roller inconsistencies. I guess I should have put a legal disclaimer at the bottom of my post that numbers are only guidelines and liable to change!!

Haven't seen your results posted?
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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CÚdric  



Joined: 27 Aug 2004
Posts: 1985
Location: Sweden

PostPosted: Mon Jun 03, 2013 3:47 pm    Post subject: Reply with quote

Carrera RSR wrote:
Cedric, I appreciate your watch out on roller inconsistencies. I guess I should have put a legal disclaimer at the bottom of my post that numbers are only guidelines and liable to change!!

Haven't seen your results posted?


Sorry guys, I┤m just slightly brain damaged when it comes to things like this, since I work with engine gas exchange performance (at a truck company though), and thus run engines in test cell from time to time..

I┤m still chasing after a good place to run hub dyno, none of them seems to be open on weekends, which makes it a little bit tricky. But might have found a place close to work, I hope to supply results sometime during this season !
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