My new dyno results
Discussion
Don't know if maybe Rich or someone can tell me what the situation is on these. Maybe you can tell me what this torque thing is. What it all means. I know Vixpy's up to his eyeballs when we're all there so didn't want to pester him.
Following on from Monaro5.7's thread about extra HP gains from having headers i wanted to share this.
Since the first dyno at SRR we had Full exhaust, headers, air intake, cat pipes, remap etc etc and didn't gain a lot IMO. Tell me what you think.
Following on from Monaro5.7's thread about extra HP gains from having headers i wanted to share this.
Since the first dyno at SRR we had Full exhaust, headers, air intake, cat pipes, remap etc etc and didn't gain a lot IMO. Tell me what you think.
hmm 305 at wheels is just under what I got at the weekend on a hub dyno and thats with the Miltek exhaust and sports cats, no headers. That was one of the lowest figures I've had from a dyno,possibly with a sticky diff - most have been around 325-330rwhp. From that point of view I'd have thought you'd get a bit more than that from your setup as a whole. As for difference between exhaust then exhaust with headers and cats I'd have thought 15-25rwhp gain would be in the right ballpark assuming it was mapped to take full advantage.
edit: of course though you were there on different days with changed ambient conditions, different fuel, probably different tyre pressures etc so although it looks like you only got 12hp it could easily be double that and the rest is "lost" due to the other factors changing the performance of your car on the rollers.
edit: of course though you were there on different days with changed ambient conditions, different fuel, probably different tyre pressures etc so although it looks like you only got 12hp it could easily be double that and the rest is "lost" due to the other factors changing the performance of your car on the rollers.
Edited by Well_Fans on Monday 7th December 18:29
The lower graph has both lots of figures and tells the story best. Your max HP hasn't improved much but you had better HP/torque gains lower down. You seem to be +25HP at the better points.
I'd say you are still restricted in terms of maximum airflow through the engine. Whether that's an intake thing or the cam I'm not really qualified to say. I'm sure Rich will drop in his 2c worth.
I'd say you are still restricted in terms of maximum airflow through the engine. Whether that's an intake thing or the cam I'm not really qualified to say. I'm sure Rich will drop in his 2c worth.
Assuming Charlie had the RPM lined up ok both times then Id start to think your out of airflow up at the higher RPM.
You will see last time your max bhp was near max rpm. This time it was well under max rpm.
The headers made a good difference in the midrange, but should also help up high, so something is preventing them from doing their work.
You would ideally need a log of your dyno run and take a look at manifold vacuum.
For some free BHP port your throttle body mate. I think a couple of guys have done this.
The Dyno chart with AFR will also help just in case its too rich for example.
You will see last time your max bhp was near max rpm. This time it was well under max rpm.
The headers made a good difference in the midrange, but should also help up high, so something is preventing them from doing their work.
You would ideally need a log of your dyno run and take a look at manifold vacuum.
For some free BHP port your throttle body mate. I think a couple of guys have done this.
The Dyno chart with AFR will also help just in case its too rich for example.
AFR looks pretty good actually Mel. You need a log of your run. Id look at manifold vaccum and total timing for a start if you are looking to sort the top end drop off out..
Are you running the stock 75mm MAF? If so you know what I think about MAF's! An 85mm one would be better, but thats like saying horses
t is better than dogst on the carpet IMO.
Bottom line, get a log of the Dyno run next time
Are you running the stock 75mm MAF? If so you know what I think about MAF's! An 85mm one would be better, but thats like saying horses
t is better than dogst on the carpet IMO.Bottom line, get a log of the Dyno run next time
God knows, but he certainly wont have a manifold vaccum pickup as well as a timing pickup and engine temp pickup and intake temp pickup and, etc, etc. I offered my efilive for logging last time. Nobody was interested. You cant optimise what you cant see
I think I logged Gareth's run.. But Ive not sent him the log yet.
I think I logged Gareth's run.. But Ive not sent him the log yet.
Mel, your car will be better due to a nice "average" gain in HP as Magic said. More than that the torque has improved a lot too (Old saying "Horse power sells engines, torque wins races"). You should see better 1/4 times now, but as Rich has said lots of room for improvement. Attention to intake/TB/Maf/(cam?) should bring some more gains for proportionally little cost over what you have spent up to now.
If it was me. I'd be looking to get rid of the maf and altering the tune accordingly.
Having said all that you now have a very pokey car, which is nice to drive (ijn whatever mode you feel like), looks good, and sounds good.
If it was me. I'd be looking to get rid of the maf and altering the tune accordingly.
Having said all that you now have a very pokey car, which is nice to drive (ijn whatever mode you feel like), looks good, and sounds good.
Edited by MyM8V8 on Monday 7th December 19:15
stigmundfreud said:
the problem with going mafless is it will require a ste load of custom logging/tuning for her and for the £££ for a few extra ponies is it really worth it? 1200 quid to get 30bhp is money well spent, 500 quid for 5hp isn't, especially as its only at high loads when hardly used
I did say, if it was me.te load of custom logging/tuning for her and for the £££ for a few extra ponies is it really worth it? 1200 quid to get 30bhp is money well spent, 500 quid for 5hp isn't, especially as its only at high loads when hardly usedMyM8V8 said:
stigmundfreud said:
the problem with going mafless is it will require a ste load of custom logging/tuning for her and for the £££ for a few extra ponies is it really worth it? 1200 quid to get 30bhp is money well spent, 500 quid for 5hp isn't, especially as its only at high loads when hardly used
I did say, if it was me.te load of custom logging/tuning for her and for the £££ for a few extra ponies is it really worth it? 1200 quid to get 30bhp is money well spent, 500 quid for 5hp isn't, especially as its only at high loads when hardly used
This is Mel though so its as good as being you, she's a hp junkie!ringram said:
God knows, but he certainly wont have a manifold vaccum pickup as well as a timing pickup and engine temp pickup and intake temp pickup and, etc, etc. I offered my efilive for logging last time. Nobody was interested. You cant optimise what you cant see
I think I logged Gareth's run.. But Ive not sent him the log yet.
I think I logged Gareth's run.. But Ive not sent him the log yet.
You didn't offer to log mine! I would've ripped your hand off
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