Purelude

Hello Everyone.

For those who have been keeping up with what i've done with the car over the year, then you know it hasn't been a fun trip.

Installing the drag 2 kit was a pain, but knowing that it didn't make the power i wanted was worse.

The 2nd installment of the epic turbo was the hondata system. This proved to be a worthwhile purchase, but the power was still not there. I had made only 214hp with a near perfect air ratio.

here is the dyno of the hondata tuned vs what drag supplied with me.



Not too great, but still a very nice increase in power. This is when i first experienced TIRE SPIN in first gear. Amazing yes.

Now jump forward a few months. I have been doing a lot of research on turbos, getting to know them like my own two feet. I figured that my turbo specs were all wrong for our cars. So i sent my turbo to get it rebuilt to some yummy specs. It was changed to a .63 A/R turbine, with a stage 3 to4B 50 trim (from a to4E). This was done at http://www.majesticturbo.com very nice ppl.

Let me tell you about why i changed turbos. I had thought that the turbine side was too small. I had thought that i had a .48 a/r. which is very very tiny and would explain the linear growth that you see from the dyno above. This was NOT the case. I had a .63 a/r in there! wowez me when i found out (majestic already had my turbo ). But theres more. What was in there before was the to4B super V wheel. This wheel is very big and laggy, and makes power past 10psi. Past 10psi is where most of us can't afford to run. So i went ahead and switched it to a to4e 50 trim. This wheel is very nice. capable of 350-450 hp, it is not so big, and makes good TOP END POWER from what majestic told me.

Now i bet you're dying to see what i got. well here it is. 9 months of being turbo'd and i finally got to where i want (90% satisfied).

This compares NA form w/ mods (type s cams, bolt ons) to the end result of todays work.


Very nice numbers. But you might be wondering what the dip is at 6k rpm? Well, my avc-r boost controller was acting very funny. At 6k rpm it let off 1psi of boost! bastard machine, i say. So, when it lost that 1psi, the whole system suffered and had to regain that 1psi (as you see it climbing up afterwards). sucks i know, but its a simple mechanical fix. in theory, if i get my controller working correctly so that it doesn't lose that 1psi, it should continue on strong.

Here is a plot comparing what drags fuel management gave me, what hondata gave me, and finally what the new turbo got me.




Interesting yes.

Some more interesting things

This is what the new turbo did just bolted on. first run of the day, and what we ended up with when we left.


Thanks for your time. It drives pretty nice now, muoy fun. and i feel that its the most i can get on stock internals. .54 bar is what i'm pushing so about 7-8psi.

You can check out all the dynos i have at http://rspec.net/purelude

Tim

LsTurbo91

nice.. was this on 91 octane?

DIRep972

iTrader: (1)

very interesting.. 250hp will be fun though

knock on wood.. my turbo is goin on soon and of course i hope i make the power i am planning on making..


[Modified by DIRep972, 2:30 AM 10/2/2001]

Purelude

yea 91 octane, fun for all!

and just in case you want to know what it looks like.






[Modified by Purelude, 6:41 PM 10/1/2001]

98lude

very nice!!

so what did you have to do to make that 50hp increase at top end? your a/f ratio seems pretty similar at top end, but you made so much more hp!!!

btw, what psi were you running at? nice job; sure gave me some hope on my car..

falcongsr

no air filter?!?!

dustin

Did you not read his post? He spent quite a while explaining where the extra 50hp came from.

Dustin

LsTurbo91

Did you back off timing at all on the map?

98lude

Dustin:
I was refering to his last dyno sheet, where he compared his first run of the day and his last run of the day, both using the same turbo. with the a/f being pretty similar, I just wondered what he did to make the difference. Maybe there is something I am missing out?

LsTurbo91

that would be the previous turbo with the first dyno.

Purelude

at the beginning of the day, the avc-r didn't learn the boost curve. It actually did ok, but instead of losing 1psi, it lost 3psi. we couldn't get it to hold any steadier, sucks.


theres no air filter yet, because the new turbo had a bigger inlet. the filter is on order though.

VaporTrail

I have to give you a lot of props. Most people would stop after the Hondata, but since you weren't satisfied, you took the proper steps to get to where you wanted to be. Excellent work, you earned my respect.

dustin

Ok, sorry. I am a jerk like 90% of the time

Dustin

SIK IN DA HED

whut type of rims are those on your lude? are those the rotas?

98lude

dustin: thats okay; lost count of the number of times that you guys came through for me anyway.

purelude: so that is only it lost psi? hmm... hopefully, that is the same problem that I am having too.

Purelude

Yea, that 1psi we lost at 6k rpm hurt us that bad. It sucked. we couldn't combat it at all, we tried upping the boost that range, lowering it, upping the duty cycle, etc...no go..just made things crazy.

DirtyLude

Where do you have the boost line for the wastegate / boost soleoid hooked up to? The turbo port or at the plenum, like some people do?

boomslang

Awesome, I am very happy for you. What stage wheel are you using?

boomslang

One more thing, you NEED to wave that dyno in the faces of all the JRSC Prelude owners. It'll make them sick!

Purelude

Dirtylude -

the pressure source is right on the intake manifold. the avc-r uses this alone with no sharing. It's using the 3rd nipple on the intake. It's weird, the garret housing doesn't have a compression hole like my old one did, so i had to get creative w/ the hoses.

Inlinefour -

its a stage 3 wheel O yes, i will wave it around for those jsrc guys!




[Modified by Purelude, 8:15 AM 10/2/2001]

Seraph0

It's all in the turbo

One question tho that maybe I missed.

You said you HAD a Super-V and then went to a E.50. (Super-.50?). But what turbine wheel did u originally have? Sounds like you had a Stage1 (stock) turbine and then went to a Stage3?

Purelude

the turbine was originally a stage 3 as well. i didn't feel good going into the dyno....especially after pulling 208hp on the first run, but hey, tuning is cool.

ArizonaTurbo

I am very surprised that the drag gen 2 kit came with the .48 housing, especially since you have such a big motor! I have a 2.0L and my fist turbo was .63 housing, stage III turbine, 57 trim .60 AR compressor (T3/T04E). The car would start building boost at 2800 rpms even with 8.5:1 CR and I would have full boost @ 3500 rpms! I then decided to go up to the .82 housing and it was killer. I still had full boost at 4400 rpms and once it spooled up, it was just nasty! I think you could make some serious HP if you go up to the .82 housing w/ Stage III turbine. You shouldn't worry about lag becuase you have higher CR than what I have and you have .2L of displacement more than what I have! I think you can make 300-325 easily to the wheels with no problems!!!!