What will it make on the dyno?

[BruceH]

Over a week into your three week contest. Hurry up and get your car on a dyno, Bruce!

I'm going to see about getting an appointment for one week from today.

 

[Boaisy]

623.96 rwhp / 555.71 rwtq on 3" pulley with headwinds of 2.5 knots (not counting any fans blowing on the motor).
666.027 rwhp / 597.88 rwtq on 2.65" pulley with tailwinds of 5 knots.

 

[saleen07gt]

572/553

 

[Department Of Boost]

572/553

You're about 1100 power points short.

 

[BruceH]

FWIW I did a log today. I selected parameters for dialing in the moving idle and forgot all about returnless fpump dutycycle. However, it appeared to be running out of fuel towards the end of my 7200 rpm redline. There was still enough to keep the a/f safe but it was climbing in a way that is almost a signature for running out of fuel system. I only have 50psi commanded for the GT500 injectors so it might be fixable. Turned the pressure drop up to 58psi for higher pounds of mass.

I think we'll see soon enough. It's pulling hard enough with the 3" pulley that I really don't see a need for the 2.65". If there is enough fuel system left I'll still put it on and see what happens.

 

[Department Of Boost]

I know how to fix that..............more fuel!!!

 

[jodadejss06gt]

 

[crownaviation]

^^ lol @jodadejsst

 

[Kidd]

3" 599/581

2.65" 634/619

 

[one eyed willy]

657 rwhp / 610 rwtq on 3" pulley 697 rwhp / 630 rwtq on 2.65" pulley

 

[swflastang05]

696/649 - 729/667 (not sure if anyone else already picked these numbers too many to read!!)

 

[BruceH]

You guys are a little crazy imo. The 3" pulley is making 7 pounds of boost. FWIW I'll use the SAE corrected numbers. Pretty sure it's not going to have enough injector for the 2.65. The pull has to reach 7k rpm to count.

 

[JoshK]

Are you still running the same fuel system that supported the 699 on E85 before Bruce?

 

[BruceH]

Are you still running the same fuel system that supported the 699 on E85 before Bruce?

Almost. Different injectors. The new GT500 58lb? at 3 bar. A while back I calculated them maxed out at 76lbs iirc. That was with 4 or 5 bar, can't remember. Just pumped the psi up to 58psi.

The 970cc Bosch Racing injectors that were used with the procharger were only at 39.15psi.

 

[Department Of Boost]

Almost. Different injectors. The new GT500 58lb? at 3 bar. A while back I calculated them maxed out at 76lbs iirc. That was with 4 or 5 bar, can't remember. Just pumped the psi up to 58psi.

The 970cc Bosch Racing injectors that were used with the procharger were only at 39.15psi.

As long as you don't run out of fuel I think I'm looking pretty good.

 

[05stroker]

702/635 max on the fuel system regardless of pulley.

 

[K_Brogoitti]

Ill say 580/550 on 3" and 625/590 on the 2.65"

 

[Corpo]

626 587 7psi
672 608 10psi

 

[BruceH]

569/509 SAE corrected. 585/523 STD and Uncorrected. SAE total is 1079.12. Hammeron guessed the closest.

It didn't run out of fuel but I didn't put the smaller pulley on. I'm sorry but arthritis pain almost had me canceling the appointment all together. Pulley swap just didn't happen.

It looks like this little blower is most efficient up to 6k and then it drops off. I'm thinking it has something to do with my combo of bore, stroke, and total displacement along with the ported heads and blower cams.

Comparing uncorrected numbers with uncorrected n/a numbers it picked up 150/137rwhp/tq with an observed 8psi. Not bad at all considering the cost and low boost. IIRC I have a total of under $3k invested. I really like the power level. Many times I've stated that around 550 is where the fun starts to fall off on the street with this car.

Does anyone know what a GT500 with the M122 makes at 8psi? It probably isn't that low of boost from the factory. My displacement is only about 8 cubic inches less.

I'll probably put the smaller pulley on at some point just to do it. Or, more likely I'll purchase a 2.3 tvs during a moment of insanity.

Here's the dyno sheet. I'll post up the corresponding datalog shortly.



Edit: Here is the datalog. The values are at 7072 rpm.

 

[cm581978]

great numbers