Thread: Lame dyno results.

you guys are running awfully rich. i run my turbo car at 11.6-11.8 afr and have tuned several m90 cars at 12.0-12.2... without issue.

X2 on the injectors. No way your maxing them.I'm running a gen v 3.4 pulley, 15° wot timing, 11.3 afr, XP cam,still have space.

Fuel pump and or filter issues?

Whats wrong with below 16º of timing? I'll never understand why some think that you shouldnt go below what stock is set at. I never had a issue running 13-15º, 1 degree of timing is maybe 3-5hp that you MIGHT be missing out on and who cares at that point.


And as far as the AFR side goes, I blame the climate and sea level as well as fuel and the fact that every car is different. I couldnt run leaner than very low 11's without it acting up on 93 E10. So keeping it at 11.0 was what I dealt with and just stopped caring. The heaton doesnt help there anyway either.

EGT's.

MPG's.

Sluggish throttle response.

Crap overall performance.

I personally never wanted to see less than 16* for a reason.

How much MPG do you gain at WOT with a few extra degrees timing? Never even bothered to watch my MPG when I'm all out, maybe I will next time, see what the DIC says.

Originally Posted by blueguy

EGT's.

MPG's.

Sluggish throttle response.

Crap overall performance.

I personally never wanted to see less than 16* for a reason.

Agree, i seen a very noticeable difference from 13* to 18*.

We arent in the gas long enough for EGT's to really matter than much.

MPG at WOT is for the lulz, I got 2.5 to 3 mpg if that.

How does throttle response relate to a timing figure below stock for WOT?? It's still going to pick up and go.

I didn't see a loss in performance with 13-15º, I ran there because it didn't knock. I'll take the 2 psi more in boost pressure and 1-3º less in timing and still make more power than stock.

Timing isn't everything but no doubt that in certain vehicles a higher timing figure would be sought after to make the most power possible. I know I refer to this alot but look at turbo'd LS motor, guys run 12-15º and still make 500+ WHP on under 12-14 lbs of boost on pump gas.

Originally Posted by Fivefingerdeathpunch

We arent in the gas long enough for EGT's to really matter than much.

MPG at WOT is for the lulz, I got 2.5 to 3 mpg if that.

How does throttle response relate to a timing figure below stock for WOT?? It's still going to pick up and go.

I didn't see a loss in performance with 13-15º, I ran there because it didn't knock. I'll take the 2 psi more in boost pressure and 1-3º less in timing and still make more power than stock.

Timing isn't everything but no doubt that in certain vehicles a higher timing figure would be sought after to make the most power possible. I know I refer to this alot but look at turbo'd LS motor, guys run 12-15º and still make 500+ WHP on under 12-14 lbs of boost on pump gas.

I can deal with less timing in certain situations. But for what the OP is doing, I would suggest he pulley up to a 3.6 and run more timing.

Originally Posted by Fivefingerdeathpunch

We arent in the gas long enough for EGT's to really matter than much.

MPG at WOT is for the lulz, I got 2.5 to 3 mpg if that.

How does throttle response relate to a timing figure below stock for WOT?? It's still going to pick up and go.

I didn't see a loss in performance with 13-15º, I ran there because it didn't knock. I'll take the 2 psi more in boost pressure and 1-3º less in timing and still make more power than stock.

Timing isn't everything but no doubt that in certain vehicles a higher timing figure would be sought after to make the most power possible. I know I refer to this alot but look at turbo'd LS motor, guys run 12-15º and still make 500+ WHP on under 12-14 lbs of boost on pump gas.

All I read was I have no hard evidence it made less power or ran worse other than I think it did.

I see no hard evidence on your side either.

Originally Posted by Ginseng

Agree, i seen a very noticeable difference from 13* to 18*.

This too.

I've been as low as 14 degrees timing, and now i'm at 17.5+

It's definitely a big difference between the two and I was faster on a 3.4 with 17+ degrees, than a 3.2 with 14 degrees. Personally, I'd taking timing over boost, as I see a more noticeable increase in power rather than going to a smaller pulley.

But I'm now running a 3.0 with 17.5* with some head room to spare. And at this point, I will not drop to a 2.9 and keep throwing more boost at it, as I'd rather increase the timing to roughly 19* now.

Originally Posted by kewGTP

He said my injector cycle was at 98% but I will confirm that with my HPTuners version . And if I would have been in the 240/270 range, no, this post wouldn't exsist. I suppose my goal for the post was to see if there is anything I'm missing that could explain the lower than expected numbers. Leaning it out to 11.5 might be an option .

Hptuners calculation (specifically the pulse width part) is wrong for all 04+ grand prix. It reads roughly 15% too high. I havent figured out the correct formula for it yet mostly because the information for it is not availible.

Originally Posted by Fivefingerdeathpunch

I see no hard evidence on your side either.

Consistant facts on multiple platforms prove that wrong.

www.google.com

Soooo my friend and I searched high and low to find the fuel filter only to find that it has been removed and just fuel line is in its place! My question is how plausible is it my injectors have been/are being damaged with no filter to protect them? I'm getting the filter installed in line in a few days FYI
https://flic.kr/p/AaC713

your car never had a in line filter, the sock on the fuel pump is your filter. id say your injectors are fine.

You also have to remember that this is an 04+ car. Stock injectors will not go as far.

My comp g with a stock pulley and stock injectors was showing over 100% injector duty cycle at about 5500rpms. I know that's not really correct, but it probably was 95% idc corrected.

Agreed, The fact the 04+ is a returnless system does in fact give you less Injector headroom. I know many guys that have run out of injector on nearly stock setups