Getting the delta 65 tuned tommorow, how hard would you push it - SRT Forums

Brian87gt · 10-29-2009, 04:46 PM

I'm going to Pwerks to get it tuned tommorow and am curious as to how much boost on race gas I should throw at it. Here's the mod list

CP pistons
Eagle rods
DCR oil system
BS removed & crankscraper
DCR 5 layer head gasket
Ported and polished head with bigger valves
Crower S2 cams with unorthodox cam gears
Delta 65
AGP race FMIC
Ported intake
LFS TB
Stage 1
Diablo Sport
750 cc inj with return line
255 in tank & 255 inline pump
Devils own progressive meth kit with M7 nozzle

For the race gas tune i'm using straight 110 race gas. How much boost could I get away with since I don't have a strap kit? Is 30 psi to much? Thanks

hshredder18 · 10-29-2009, 05:02 PM

i dont know what psi to run it at but let us know what it puts down. this is the turbo im building my motor for or the hta 60

cwood · 10-29-2009, 05:18 PM

go big or go home.

MikeRT4 · 10-29-2009, 05:24 PM

Start low and move up...

Turbolag87 · 10-29-2009, 05:33 PM

should be ok just dont rev it to the moon without the strap and those rods, Rev her to 7300rpm.

nutz · 10-29-2009, 11:38 PM

with a proper tune 26-27 psi should max out your fuel

1fastSRT · 10-30-2009, 05:43 PM

on my 750s@43 FP I was maxing my injectors out at 21psi

conroy9940 · 10-30-2009, 05:47 PM

i would not rev past 6700 with them rods and without a strap kit.

**bitts** · 10-31-2009, 12:15 PM

What kind of power are u trying to make ?

Jon@AGP · 11-02-2009, 11:18 AM

Slowly turn it up and make proper adjustments. Every setup is going to be different on how much boost you will need to max that setup out.

**c2k** · 11-02-2009, 08:12 PM

Quote: Originally Posted by Brian87gt

Eagle rods

I wouldnt even try to push it at all w/ these rods and without a strap kit.

if you have lots of $$ to blow and wanna blow your motor, go for it. Otherwise I strongly encourage you to get diff rods and get a strap kit.

**04blusrt_4** · 11-03-2009, 09:27 AM

First off, i think weve seen a huge power loss after 6500 on this turbo, but with fantastic early power and torque. So I think you are in safe range with the rods rpm wise, but just don't push the rpms past where its making power. High rpms + no power = rod stretch and cracking.

Second, with dual pumps you should have no problem holding 80+psi fuel pressure out to redline even with a 90%+ injector duty cycle. That coupled with the methanol and the race gas (which can be run leaner) I think you have plenty of fuel to max out your bottom-end (I wouldn't tune past 550whp).

Adjust your cams so your powerband is between 4k and 7k and get a nice 12.0 AFR and you shouldn't have to run past 26-27psi to hit your target. Dont tease the torque curve too early, again your rods dont cope well with pavement stomping torque.

Goodluck, keep us posted. I agree with others, a strap kit is a bit of a must at your levels, just too much risk of a shift in the bedplate causing cracks with a bearing and rod failure.

wonderboy · 11-03-2009, 10:17 AM

Not to get too far off topic, but I really wish we could get some better answers on the strap kit and when it is 'actually' needed. Has anybody brought this question to the SRT engineering group?

For instance, I read the following:

"The SRT-4 drag teams are rumored to be making between 800 and 1200 hp on the stock crank (and stock block and bedplate), so we figure it's strong enough."

Dodge Neon SRT-4 - Project Cars - Sport Compact Car Magazine

Quote: Originally Posted by 04blusrt_4

First off, i think weve seen a huge power loss after 6500 on this turbo, but with fantastic early power and torque. So I think you are in safe range with the rods rpm wise, but just don't push the rpms past where its making power. High rpms + no power = rod stretch and cracking.

Second, with dual pumps you should have no problem holding 80+psi fuel pressure out to redline even with a 90%+ injector duty cycle. That coupled with the methanol and the race gas (which can be run leaner) I think you have plenty of fuel to max out your bottom-end (I wouldn't tune past 550whp).

Adjust your cams so your powerband is between 4k and 7k and get a nice 12.0 AFR and you shouldn't have to run past 26-27psi to hit your target. Dont tease the torque curve too early, again your rods dont cope well with pavement stomping torque.

Goodluck, keep us posted. I agree with others, a strap kit is a bit of a must at your levels, just too much risk of a shift in the bedplate causing cracks with a bearing and rod failure.

rubicon04 · 11-03-2009, 10:25 AM

Ever get it tuned ? I laugh all the time when people bash eagle rods, For literally 90% of the members on this board they are fine. Although in this situation and for the power level your setup is capable of, I would have gone with a strap kit for safety measures.

**04blusrt_4** · 11-03-2009, 10:35 AM

Dont go by rumors, go by the most common info out there - ie cracks happen even after 300whp if the car is abused...

Cracked bedplate - Options?

Possible to replace the bedplate?

Cracked due to motormount (doubtful)
Who Is the Best Porters,?? Turbo, Exhaust, Intake Manifolds

Some informed posters describing why it can crack...

Cryoed Bedplate??

I doubt anyone of these guys were running 800whp when it cracked...just be mindful, most people will never know if they have a cracked bedplate until they pull apart the engine