ZR1 - Stock Injectors Limit

[Brice]

I have to tune a modded C6 ZR1 (Harmonic Balancer, Pulley, Headers).
My customer living 500 miles away.

The question is : Are the stock injectors still in the 80% duty cycle with these mods ?
Ligenfelter told my customer : "It depends of the tuner".


Any experience ?

[4evervette]

seen one with duty cycle 110% ... however tuner was able to command 10.5 AFR ..fuel press was 88 psi @ WOT ..

DC :rpm * IPW / 1200....... personlly i think its the IPW that is not accurate on the E67..


please correct me if i was wrong ...


BTW ... how RWHP did you get on that beast ..

[redhardsupra]

what's the stock size and fuel pressure on the ZR1?

[DSteck]

Stock they run 88psi in the rail at WOT and the injector flows somewhere around 61 lb/r at that point (assuming roughly ten psi boost).

[vette_c6]

in your STOCK motor
i am talking about the fuel system ,,
if your tuner can get the AFR 11.8 as a FORCED induction ,, i think that will be fine

no one will be able to answer this answer now ,, except you or someone who have tuned one ,, myself havent tuned one yet

good luck ,, and i would like to keep updated
tell us how much boost did you get ,, and i hope you log your dyno scan ,, cheers

[Brice]

I have already tuned a stock zr1.
This one is modded, I ve never seen it in front of me.
Can t wait to tune it. But I m affraid the stock injectors will not be enough.
My customer doesn t want to but injectors yet.
I have to be carefull.

[jason@psi]

So, funny I came across this post. I'm currently sitting in a 2010 Zr1 on the dyno with the same current mods - ATI, Pulley 2.6, LPE hp snout, Headers, and exhaust..

First off, my understanding is LPE has some math wrong. They used a Camaro LS9 configuration to belt length on there website chart. The power steering pulley is smaller on the Camaro so the belt chart is wrong. On the first pull I'm seeing 235kpa plus @ 5000 RPM and injector duty @ 100 percent @ 3400 RPM
AFR is still rich @ 10.5-1 and power is 570 @ 5000 RPM and tq is 615 @ 4500 rpm measured at the wheels on a dynojet. I'll let you know how it goes but this might be a little unsafe

[4evervette]

So, funny I came across this post. I'm currently sitting in a 2010 Zr1 on the dyno with the same current mods - ATI, Pulley 2.6, LPE hp snout, Headers, and exhaust..

First off, my understanding is LPE has some math wrong. They used a Camaro LS9 configuration to belt length on there website chart. The power steering pulley is smaller on the Camaro so the belt chart is wrong. On the first pull I'm seeing 235kpa plus @ 5000 RPM and injector duty @ 100 percent @ 3400 RPM
AFR is still rich @ 10.5-1 and power is 570 @ 5000 RPM and tq is 615 @ 4500 rpm measured at the wheels on a dynojet. I'll let you know how it goes but this might be a little unsafe

plz keep us posted of the outcome ...

[jason@psi]

plz keep us posted of the outcome ...

Correction .. the car was equipped with 2.35 pulley! Client is debating on going to 2.6 to drop the boost down to a little safer level for 92 oct.

I will keep you posted. little off topic ^^ I see you are from UAE where about? Got back from a trip not too long ago to UAE. Wonderful place!!! liwa dunes were incredible

[4evervette]

am from Dubai ....

are seeing 18-20 psi...and how far car you spin the engine with 2.35 ..??

[vette_c6]

I havent tuned any zr1 yet
So i would like ask a question
Under Engine on vcm editor
Is there is any table that i have to adjust ?
Or its exactly like any other car ?

I wish one of u guys can shot any zr1 file
With any smaller pulley or bigger

Would like to have a look
Cheers

[4evervette]

i think its like any other car ..however under torque management -- supercharge -- there are few parameter needed to adjusted to accommodate the increase of boost ...

[Brice]

I havent tuned any zr1 yet
So i would like ask a question
Under Engine on vcm editor
Is there is any table that i have to adjust ?
Or its exactly like any other car ?

I wish one of u guys can shot any zr1 file
With any smaller pulley or bigger

Would like to have a look
Cheers

I will!

[Brice]

So, funny I came across this post. I'm currently sitting in a 2010 Zr1 on the dyno with the same current mods - ATI, Pulley 2.6, LPE hp snout, Headers, and exhaust..

First off, my understanding is LPE has some math wrong. They used a Camaro LS9 configuration to belt length on there website chart. The power steering pulley is smaller on the Camaro so the belt chart is wrong. On the first pull I'm seeing 235kpa plus @ 5000 RPM and injector duty @ 100 percent @ 3400 RPM
AFR is still rich @ 10.5-1 and power is 570 @ 5000 RPM and tq is 615 @ 4500 rpm measured at the wheels on a dynojet. I'll let you know how it goes but this might be a little unsafe

Niiice!
Where have you set the rev limitor?
Can you post the dynosheet?
I m using a superflow dyno, so the number will be lower than the dynojet

[Slow Sedan]

Did you find the limit? I did 575whp on 9-10lbs at 58PSI and ZR-1 injectors were ok, thats through a 6L80. I'm raising it up to 13lbs and raising fuel pressure to 65lbs now through a TH400. We'll see... ZR-1 stock tune is a bit off from what the Lingenfelter cal table lists.

[vette_c6]

intresting subject guys ! ,,,,
this bloody ZR1 is a monster !

i am still waiting for STOCK files ,, and after adding extra boost ,,, the most think that i would like to see
is under TQ mang supercharge

i would like to know if this table should be changed ,, or u just tune it like any other corvette

cheers guys

[4evervette]

intresting subject guys ! ,,,,
this bloody ZR1 is a monster !

i am still waiting for STOCK files ,, and after adding extra boost ,,, the most think that i would like to see
is under TQ mang supercharge

i would like to know if this table should be changed ,, or u just tune it like any other corvette

cheers guys

here is a good start

i think its like any other car ..however under torque management -- supercharge -- there are few parameter needed to adjusted to accommodate the increase of boost ...

[Brice]

There is stock files on the repository.
I ve made another post on tuning stock zr1.
I ve gain 25 rwhp+ with just pe.
I ve gain 0 hp messing with timing on 93 octane.

[vette_c6]

There is stock files on the repository.
I ve made another post on tuning stock zr1.
I ve gain 25 rwhp+ with just pe.
I ve gain 0 hp messing with timing on 93 octane.

good info

[Brice]

good info

+21hp / + 18 NM


http://www.youtube.com/watch?v=MLwqRab97So