anyone know about this turbo in a detailed manner.
I've been trying to work on getting this turbo to spool sooner on a 1.8L gsr setup.

best I got in the mid range at 6k rpm is 300whp and then at 6.5K 440whp.. 7Krpm 515whp....then maxs out at a bit over 600whp or so above 7.5Krpm-9.5Krpms..... This is all done at 29psi on DFI........

any suggestions to wake this dual ball bearing turbo up..... maybe jump the ign. timing to 32-35degree between 5-7K rpms??? some say this will help just as long as I can support enough fuel.... currently running mid 20s for ign timing at those rpm points...

 

Smaller turbine housing?

 

gt40r is big for a 1.8l.... maybe thats why there is so much lag...

 

That is a terrible turbo, worst turbo EVER!!! ......Please sell it to me.. pleeeeeease!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lsvtecpower &raquo;</TD></TR><TR><TD CLASS="quote">maybe jump the ign. timing to 32-35degree between 5-7K rpms???</TD></TR></TABLE>

Yea, try that and see what happens...hahahaha

 

I am no certified tuner or certified any thing for that matter but I do that it's a big turbo that you are trying to spool with a 1.8 and that you should'nt be expecting too much out of it. On top of that you are asking if you should increase the timing to that high amount, well you should know since you are certified right? In my personal opinion that turbo is too big for what you want and that timing is too high. By no mean am I trying call you stupid or anything, it's just that with the use of the search button you can learn alot on this site, as to what works and what doesnt. Goodluck with it man

 

32 degrees of timing on 29 psi? HAHAHA do it and take pictures of the poieces of the motor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suprdave &raquo;</TD></TR><TR><TD CLASS="quote">

Yea, try that and see what happens...hahahaha</TD></TR></TABLE>
i love this guy

 

it sounds like something may be wrong with your motor, or maybe you have a manifold crack or exh leak? That turbo is spooling wayyy too late

 

increasing the timing before the torque peak is moderately safe and will help spool, I doubt you'll see a lot of benefit going above 28* or so while spooling. but defiantely start dropping timing as you near high boost/torque peak. kinda hard to give more detailed answers without more info though...

 

5-7k is torque peak bro...

 

consider getting a smaller turbo your tiny 1.8 can sppool, or get a stroker kit, which I dont think will help you much with this application, if earlier sppoool is what youre looking for.

 

also check for boost leaks, that will cause a lazy spool and also destroy the turbo

 

This turbo is really for a quick top-end power punch and that is about it. I've been planning, configuring and desigining turbos for years, and the problem in this situation is that the GT40R is ill matched for trying to acheive top end power, (Which is what it is good at) while still trying to make "quick spool" and expect it to behave like a turbo half its size. This is another example of the Ball-bearing CHRA as the right part for the wrong purpose. The GT40R expects the motor to have additional STROKE in order assist with a more smooth powerband. Quick fixes like increasing timing on such high boost is really asking for the motor to be rebuilt. I've used GT40Rs on Evo 6s, 7s, and 8s, as well as several 13B cars, all which have a better rod/stroke ratio (except for the 13B, of course, but the efficiency of the rotary compensates for the lack of actual displacment), and it was much better matched for an application than the 1.8Litre.

It's time to reevaluate what the purpose is for this motor, for there are MANY applications that can accomplish the top end power / Dyno number queen goal.

 

been tuning for a while guys(hence DFI..how old is that sucker)... seen higher timing done, but never 30s.. that's why i asked... i am by no means stupid either. just wondered if anyone done any miracles with this turbo by playing with timing. at full boost on t3/t4e/60-1 turbos i've done 26-28degree with good success...big increase in power...

some people....no names mentioned ok guys..hehe!!! told me they've tried and it worked, just as long as fuel is ok... haha!!! now it makes you guys wonder why low boost makes so much POWER.......


Modified by lsvtecpower at 8:42 PM 6/10/2005

 

geoff....could be diff things.... i'll look at it more~~~ thx for your professional reply


Modified by lsvtecpower at 8:41 PM 6/10/2005

 

now this is a good response.... while most others are all neg... thx guy!!!!

sometimes tuners can overlook things....cheersss

 

Modified by lsvtecpower at 8:40 PM 6/10/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TheShodan &raquo;</TD></TR><TR><TD CLASS="quote">This turbo is really for a quick top-end power punch and that is about it. I've been planning, configuring and desigining turbos for years, and the problem in this situation is that the GT40R is ill matched for trying to acheive top end power, (Which is what it is good at) while still trying to make "quick spool" and expect it to behave like a turbo half its size. This is another example of the Ball-bearing CHRA as the right part for the wrong purpose. The GT40R expects the motor to have additional STROKE in order assist with a more smooth powerband. Quick fixes like increasing timing on such high boost is really asking for the motor to be rebuilt. I've used GT40Rs on Evo 6s, 7s, and 8s, as well as several 13B cars, all which have a better rod/stroke ratio (except for the 13B, of course, but the efficiency of the rotary compensates for the lack of actual displacment), and it was much better matched for an application than the 1.8Litre.

It's time to reevaluate what the purpose is for this motor, for there are MANY applications that can accomplish the top end power / Dyno number queen goal. </TD></TR></TABLE>

good job guy....i new someone like you would appear... If it wasn't timing it definitely is the turbo sizing.... guess hondatech has it's goods too...

 

this turbo may be up for SALE..........................PM me guys...


don't worry we are a legitimate race shop...

 

do what some of us do and spray that bastard with a pre designated hobbs switch to shut the nitrous off at your desired boost pressure!!!!!!! do it!!!


i am above 28 degrees of timing on pump gas!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrbsponge &raquo;</TD></TR><TR><TD CLASS="quote">do what some of us do and spray that bastard with a pre designated hobbs switch to shut the nitrous off at your desired boost pressure!!!!!!! do it!!!


i am above 28 degrees of timing on pump gas!</TD></TR></TABLE>


you are above 28degree....at full boost/full nitrious??? on pump gas??? or are you 28degree at normal drivning ranges???

NOS was suggested, but I may just downsize the gt40r to a gt35r instead for better midrange...

 

[IMG][/IMG]

 

i should have a dyno plot up tomorrow of a gt40r on a 2.0l, I'll post it for comparison