Should My Hks Gt-Rs Be Making Boost Earlier? (E85)

[LaurelPWR]

Just bought a new eboost2 controller so that with the non cat, boost leak fix, throttles tuned and e re tune should see some better results and hopefully a bigger peak power figure (:

[LaurelPWR]

So I aquired a compressor and made a boost leak tester and holy crap I have a million boost leaks around the plenum and injectors so there would lie the boost problem .....

[jake26]

Oh wow haha, should see some good gains soon then!

[LaurelPWR]

Oh wow haha, should see some good gains soon then!

Yeah man i reckon i should see good gains haha /: 2 of the three throttle gaskets are leaking big time, the first and last injector seals are leaking, a few vacuum lines are leaking badly and there are 4 or more pin holes in the throttle adapter plate welds............ i could watch the pressure gauge on the compressor go down quite steadily after it finished filling itself and the tap was turned on to charge the intake system...

[LaurelPWR]

d.i.y boost leak tester lol

Edited March 31, 2014 by LaurelPWR

[Blackkers]

whatever works

[simpletool]

Just converted my rb25 s13 to e85. the car feels a lot faster but should it be making full boost sooner???

also puzzled at how boost and power comes on later than the bp98 .....

Has the following mods:

Standard rebuilt rb25

acl bearings

arp bolts throughout

tomei poncams

hks ex cam gear +8 i think

hks gtrs turbo kit on standard manifold,

custom japan made r32 gtr 6 throttle plenum

retains standard side feeds high flowed 740cc

greddy cooler

apexi induction kit and pod

turbosmart plumb back bov

3inch turbo back exhaust 100cell cat straight through to twin cannons

power fc

walbro 460

tomei fpr

koyo rad and greddy oil cooler

blitz spec r boost controll

excedy light flywheel

nismo 2way lsd

etc...etc..

the bottom red line in dyno 1&2 is the bp98 18psi

the middle pink line in dyno 1&2 is E85 on the same boost

the top orange line in dyno 1&2 is E85 20psi and some tweaking

dyno 3 is just differant boost settings after it was tuned obviously....

Back to original post.

1. Boost threshold should be VERY similar between fuels. I'd suggest the E85 tune is too lean on ramp up, or there is a manifold/gasket leak, or timing issue.

2. 20psi is almost certainly too much for a GTRS on an RB25 to use at the track. Just be on the look out for heat soak issues and turbo wear, depends on how much WOT you use. 16/17 psi is typically the upper limit. I'm not talking knock issues with dynamic compression since they disappear wtih E85, I'm talking turbine heat issues and compressor overspeed.

Edited April 3, 2014 by simpletool

[LaurelPWR]

This should help delete top end restriction ......

[LaurelPWR]

Back to original post.

1. Boost threshold should be VERY similar between fuels. I'd suggest the E85 tune is too lean on ramp up, or there is a manifold/gasket leak, or timing issue.

2. 20psi is almost certainly too much for a GTRS on an RB25 to use at the track. Just be on the look out for heat soak issues and turbo wear, depends on how much WOT you use. 16/17 psi is typically the upper limit. I'm not talking knock issues with dynamic compression since they disappear wtih E85, I'm talking turbine heat issues and compressor overspeed.

As said in earlier post, massive boost leaks all over the inlet plenum where found after my boost leak test dude

The plenum set up has definitely been like this the whole time its been on the car, since dare i say "Nizzpro" put it on my car....while i was running bp98 and no change to the set up now with e85... it goes in next week to be re welded and all injectors are getting overhauled and new hks gaskets throuhgout

[Piggaz]

Single cell cat. Perfect

[Blackkers]

What's the fine for that? I'm sure you can get away with it.

You'd have to be really unlucky to end up being escorted to the inspection facility like some of the idiots who hoon around the city on a Friday night. Most of the time they just give you an EPA notice.

I was given one a year ago because the car was too loud, I just needed an excuse to drop some money on a decent catback really; previous owner thought a 4inch catback was a good idea..

[GTRPSI]

You get time to get the emissions test done, enough time to bolt in the most restrictive cat you can find and pass the test.

If its just a sound test they wont be getting under and unbolting the cat to look inside.

[LaurelPWR]

You get time to get the emissions test done, enough time to bolt in the most restrictive cat you can find and pass the test.

If its just a sound test they wont be getting under and unbolting the cat to look inside.

This is true haha i have had my car over the pits twice and you get time to sort your defects and shit for re inspection etc

[LaurelPWR]

I read Joeyjoejoe's E85 Tuning Adventutres and i noticed my dyno printout has very similar characteristics (apart from the spike) to his first dyno as in the way boost comes on slowly peaks and drops off straight away.... obviously he had boost leaks and then fixed them and had a re tune and got epic little gains.... man i hope i get similar gains

http://www.skylinesaustralia.com/forums/topic/258776-joeyjoejoes-e85-tuning-adventutres/

[wolverine]

Have you thrown up your dyno sheet?

[LaurelPWR]

Have you thrown up your dyno sheet?

First post dude

[wolverine]

I mean since you found the leaks.

[LaurelPWR]

Hasn't been back on the dyno since I did the test last week... Those printouts in post 1 are only 3-4 weeks ago anyways man...

[scotty nm35]

You dyno'd the car with leaks, that means the tune is probably way out, perhaps enough to cause serious problems...

[LaurelPWR]

I wasn't awere of the leaks until I had the e85 tune done and saw that my gtrs seems slower to come on boost then others I had seen so I started investigating which led me to a boost leak test and so I found a ton of leaks and am obviously getting them fixed this week as well as an eboost2, jim berry single and de cat... Hopefully I'll get in for a re tune at the end of the week or early next week... The car has not been driven since I found the leaks hey