Vg30 Housing On Gcg Or Not

[benl1981]

I am getting my turbo fixed by GCG>

I want to know if it is worth getting the VG30 housing for around 240rwkw or will it just cause more lag.

For 240rwkw is it better to stick with the R33 housing to retain response?

Thanks

[BAMR33]

VG30 for sure, the rb25 housing really is limited when you start hi-flowing. You won't notice much difference in response comparing vg30 hi-flow with rb25hiflow if the exhaust housing are bored out to the same diameter. Some people with stock vg30 turbo's notice no difference in spooling time compared to the rb25 turbo.

[benl1981]

Thanks mate. So the difference is very minimal?

Might go the vg30 then..

But the r33 Hiflow housing seems to make 240rwkw - bu would it make that easier with the vg30?

[sweetr33]

ive had personal experience with gcg hiflow with vg30 ex housing.. would recommend it. was great. made 258kw at treads on 15psi on my engine, definately worth the extra coin. do it once and properly insted of being limited to 240kw or a squeeze more

[benl1981]

thanks sweetr33.

thats good power at only 15psi!! What about your 1/4 time. I thought with that power you should be mid 12s. Were you wheelspin city?

[CEF11E]

I am also considering getting a VG30 housing on my hiflow. I have a slide RB25 hiflow that is going on a RB30DET. as slide is no longer doing hiflows I would have to get the VG30 housing machined to fit elsewhere. anyone have any idea what sort of cost is involved? I have rung a few places and incl gcg and got a lot of different answers.

The reason for keeping the hiflow is wanting to retain the stock look and I am not going for any world records. 260rwkw will be fine. currently the hiflow makes 240 on my RB20.

[MANWHORE]

Ceff - there is no need to go to a place like gcg. Last time I asked them, they were looking for around 300 labour. I'd rather put that money towards the cost of the housing instead. Any machine shop with a lathe would be able to machine it out really easily to whatever spec you want. That is, either the same, less or more clearance - whatever you like.

Ben - vg30 housing is better in regards to wheelspin. One of my friends with a vg housing said that the car was a lot more driveable - more useable power with the vg. Instead of you having to watch your right foot, because the power is up a few rpm higher, less wheelspin.

Edited August 6, 2007 by MANWHORE

[benl1981]

The inlet they would use a lathe but the exh housing would be a mill job I would imagine. They cant really grip it in the jaws but on the inlet sid you can.

I'm keen on low-midrange also so I am thinking of sticking to the r33 housing. I like the wheelspin

[sweetr33]

2.3 60 foot says it all, no wheelspin at launch, bogged it down nearly very time. 112mph was good, just gotta get take off mastered but yeah with better tires i could have used more revs. now its a different ball game all together, with new setup. good luck

[benl1981]

so sweet - what sort of lag do you have compared to stock?

Is it very noticeable? Did you have the R33 housing on the hiflow to start with?

Thanks

[180or200]

Hi

anyone had any experience with the AVO exhaust housing, I'm expecting one this week, would like some feedback!

hopeing it'll free up the top end, i run into alot of back pressure around 6500 rpm, atm running gt30 machined into std housings, should be interesting.

[sweetr33]

hi, no i never had the 33 housing on it, i wanted the most out of the turbo so opted for vg30 housing first up... lag is minor, for the power the turbo makes, for me it was more responsive than the apposing cars i raced with bigger turbo's.. u wont regret it, thinking too much, just do it...haha

[MANWHORE]

Hi

anyone had any experience with the AVO exhaust housing, I'm expecting one this week, would like some feedback!

hopeing it'll free up the top end, i run into alot of back pressure around 6500 rpm, atm running gt30 machined into std housings, should be interesting.

Unless if you're getting the avo housing for a very very good price, and unless if it will allow you to maintain the straight bolt on factor of a vg30 housing, i'd give it a miss.

The vg30 housings are a lot bigger (0.8AR as opposed to the standard 0.6ar). Unless if you're running a 13b/20b rotory/rb30 or something, I wouldn't really want to go bigger than a 0.8 on an rb25.

[benl1981]

anybody have direct comparison from a R33 hiflow - then changed the exh housing to VG30?

Cheers

[180or200]

Unless if you're getting the avo housing for a very very good price, and unless if it will allow you to maintain the straight bolt on factor of a vg30 housing, i'd give it a miss.

The vg30 housings are a lot bigger (0.8AR as opposed to the standard 0.6ar). Unless if you're running a 13b/20b rotory/rb30 or something, I wouldn't really want to go bigger than a 0.8 on an rb25.

thanks, but not sure were on the same page, the AVO exhaust housing is a .73 and is a direct bolt on for the rb25

http://www.avoturboworld.com/pdf/gts_exhaust_housing.pdf

[MANWHORE]

thanks, but not sure were on the same page, the AVO exhaust housing is a .73 and is a direct bolt on for the rb25

http://www.avoturboworld.com/pdf/gts_exhaust_housing.pdf

I think I might have been a bit unclear. I was a bit tired from work.

What I was saying, is that with a vg30 housing, you get a 0.8A/R housing, which is bigger than the AVO's 0.7A/R. I was saying that the 0.8 is perfect - I feel that if i'm going to do a turbo upgrade, it had better been a worthwhile one. But on the other hand, you don't want to go too big either e.g. 1.0A/r otherwise, our 2.5L engines will have trouble spooling it (more suited to an rb30/13b/20b). 0.8 is not too big and not too small.

Also, price was another issue that I spoke about. The AVO one is 700 rrp.... whereas if you pick up a vg30 one, your turbo highflower will sandblast it anyway as part of the price, and it will come up looking brand new for half the price.

[benl1981]

Really would like to know how laggy it is. At the moment the R33 highflow with a slightly smaller exh wheel and bigg comp wheel than current GCG feels a little doughy..maybe because its running a bit rich.

The FMIC definately killed the response a bit..

Are HKS GTRS a lot less laggy than the R33 highflow with VG30.

Is a standard R33 high flow more comparable to a GTRS?

[MANWHORE]

When you say feelign a bit doughy, do you mean it feels a bit unresponsive?

Basically, the best way to describe what happens with a bigger turbo, is if you're only running around 10-12 psi, it'll feel pretty unresponsive, and it'll feel like it makes less power than stock.

Take my turbo as an example - takes a bit of time to get up to 10 psi, but once it gets up to 10, 18 psi comes very quickly.

Shoot Al a pm. Initially, he had a vg30 highflow. Switched it for a gtrs. From my experience, the gtrs make a bit more power than a standard r33 highflow. More like a vg30.

Bullant47 did a write up about his experience with changing housing on a GCG highflow. I've noticed similar. maybe about 150-200 rpm later, with loads more power.

Chuck on a cam gear - should help a fair bit.

Have you had it tuned yet? a tune helps a fair bit. more timing will help spool.

[benl1981]

Im ripping my turbo off tonight and getting it fixed.

I have a blown R33 GCG and VG30 turbo for parts. Might sell 1 of them or sell some of the parts after I've used what I need. The VG30 BB turbo is actually in really good nick. No shaft play. Might wack a different exh housing on it and sell it as a hybrid.

Have you had yours tuned CHris? If so how does it go? You happy with it now? What sort of power you making?

[180or200]

I think I might have been a bit unclear. I was a bit tired from work.

What I was saying, is that with a vg30 housing, you get a 0.8A/R housing, which is bigger than the AVO's 0.7A/R. I was saying that the 0.8 is perfect - I feel that if i'm going to do a turbo upgrade, it had better been a worthwhile one. But on the other hand, you don't want to go too big either e.g. 1.0A/r otherwise, our 2.5L engines will have trouble spooling it (more suited to an rb30/13b/20b). 0.8 is not too big and not too small.

Also, price was another issue that I spoke about. The AVO one is 700 rrp.... whereas if you pick up a vg30 one, your turbo highflower will sandblast it anyway as part of the price, and it will come up looking brand new for half the price.

Ok, I thought VG30 was .7 also, I should have the AVO this week for $480