Turbo decision help

Post by **robbbby** » Sun Mar 07, 2004 1:18 pm

I'm buying a new turbo setup very soon but have had a hard time deciding. The more I browse and read through the forums the more frustrated I get because everyone has different opinions as to what the best setup is.

I am looking for just over 300hp for now. I want a turbo that will get me there easily and will still push out higher numbers in the future. I am only looking for about 300hp now as I only have 550cc inj. and a afc. I am not ready to step up to larger injectors and better fuel management for larger inj. just yet.

I orginally had my heart set on enjukus kit but it was a bit pricey so that was put on hold. Also the s15 GT28 looked nice but won't put out more power down the road.

From the reading I have been doing I have sort of come to think the Garrett gt25/40R would suit me well.

It is bolt on an has some impressive numbers. I want something that spools fairly quickly so I was thinking about getting it in the .64 AR over the larger one.

Is this turbo a good idea. The car is mainly my summer car for just going out and having fun.

Anyone have any other suggestions for some other turbos that will get me to around 350+hp in the future and are fairly bolt on?

I know questions like this are asked all the time but any advice/help is appreciated.

Website · Post by **s13sr20chris** » Sun Mar 07, 2004 1:18 pm

ill tell you, i have been thinking about the disco potato, the gt-rs, the gt25r, and even the gt3037. thats a pretty wide spread and i cant make up my mind either. http://www.jgycustoms.com has some nice bolt on kits that are their own.

Post by **robbbby** » Sun Mar 07, 2004 1:18 pm

I had considered the disco potato (gt28rs?) but from everything I have read it is very overrated, there are lots of turbos that are much better and cost alot less.

Website · Post by **s13sr20chris** » Sun Mar 07, 2004 1:18 pm

$1000 for a bolt on turbo with 300+ whp potential? not to bad in my book. that really knocked the s15 turbo out of the running for me.

Post by **Supafly** » Sun Mar 07, 2004 1:18 pm

i'm currently having majestic turbo in dallas build me a custom setup using super60 T3 wheels in my T25 housings. a friend of mine ran the same type of setup and made ~325rwhp@20psi and it spooled quick as hell. and it's only about $550 on a good core to have done. better than S15 turbo IMHO.

Post by **ez 240** » Sun Mar 07, 2004 1:18 pm

I to am in the same boat cant dfigure out what turbo to run the disc supports upto 350 rwhp and runs around 1100 brand new.then you got the big 28 that runs to 320rwhp you also have the gt30 that can support 550rwhp then you have the t3t4 settup that has huge potential what aguy to do ?

Website · Post by **s13sr20chris** » Sun Mar 07, 2004 1:18 pm

i am currently being swayed by the gt25r/gt2540. there is another thread where a really nice dyno graph made me drool.

http://www.nissaninfiniticlub....84435

check dat out.

Post by **MainEvent212** » Sun Mar 07, 2004 1:18 pm

if it were up to me i'd liek to have a turbo that spools the same as a stock T25...but makes about 280 rwhp at 8 psi....

Post by **VitaminT** » Sun Mar 07, 2004 1:18 pm

MainEvent212 wrote:if it were up to me i'd liek to have a turbo that spools the same as a stock T25...but makes about 280 rwhp at 8 psi....

Why 8psi? I don't guess I really understand that. Why not get a S15 GT28 then. It makes 280+ and spools a good bit faster than the almighty "Disco Potato".

Personally I am going to get the GT25R/GT2540R, but I am less concerned with lag and more concerned with 400whp.

Post by **ez 240** » Sun Mar 07, 2004 1:18 pm

the disco is basicaly a t28 just alittle biger and it hits full spool at 3000rpm hits 5psi at 2000rpm

Website · Post by **s13sr20chris** » Sun Mar 07, 2004 1:18 pm

i think the disco potato makes the s15 turbo kind of obsolete. thats just me, i have not tried either one.

Post by **VitaminT** » Sun Mar 07, 2004 1:18 pm

I have a thread I will post when I get home that compared power/spool on the GT28, GT28RS (potato) and the GT25R (gt2540r).

If I remember correctly the GT28 S15 turbo spools faster.

Post by **robbbby** » Sun Mar 07, 2004 1:18 pm

VitaminT wrote:I have a thread I will post when I get home that compared power/spool on the GT28, GT28RS (potato) and the GT25R (gt2540r).

If I remember correctly the GT28 S15 turbo spools faster.

I'd love to read that since those were the exact three turbos I chose from before settling with the 25r

Post by **ez 240** » Sun Mar 07, 2004 1:18 pm

well yes the stock t28 will spool faster but it will not spool as much it is a smaller turbo compared to the other which is why the other were built.

Post by **VitaminT** » Sun Mar 07, 2004 1:18 pm

Here is the link. Check page 2, it has some comparisons. One of my favorite posts and very informative.

Post by **robbbby** » Sun Mar 07, 2004 1:18 pm

forgot the link eh

Post by **VitaminT** » Sun Mar 07, 2004 1:18 pm

Haha, yeah you probably need that

http://forums.freshalloy.com/u...&vc=1

Website · Post by **s13sr20chris** » Sun Mar 07, 2004 1:18 pm

wow good stuff.

Post by **VitaminT** » Sun Mar 07, 2004 1:18 pm

Although the whole post is very informative, here is the section that I was thinking of.

Quote is from Scott at SecretServicesINC.

"TQ at 3500 RPM

S-15 Ball bearing T-28 - 240 ft-lbsDisco Potato - 185 ft-lbsGT25R w/ .86 A/R - 165 ft-lbs

TQ at 4000 RPM

S15 turbo - 280 ft-lbsDisco Potato - 255 ft-lbsGT25R .86 A/R - 235 ft-lbs

Ok so the DP has the GT25R by a bit on spool, but lets look at top end performance.

s15 turbo 299 HP @ 6000Disco 278 HP @ 6100GT25R 360 HP @ 6500

Now heres how i interpret the data. the s-15 turbo KILLS both the other contenders in spool 55 ft-lbs tq gain over the DP at 3500 RPM. now THAT is what i consider to be a good performing responsive turbo. but hte catch 22 is that the s-15 turbo made more top end power as well??

so compare the gt25 and the DP and you'll see the DP does have the GT25R beat by a bit in spool time, but the GT25R gets 78 more HP on the top end.

So i conclude that the Dicso is overated becasue it has LESS top end then the S-15 turbo...and almost as much lag as a turbo that has 78 more hp potential.

I guess there is just no expalnation to the hype of the disco after all.."

Post by **robbbby** » Sun Mar 07, 2004 1:18 pm

Looks like I made a good choice choosing the 25r over the DP after all and saved a few dollars. Now my only dilemma is trying to find someone to weld a WG flange onto the stock cast manifold or spring for a stainless that retains the flange in the stock spot like enjuku has.

Post by **VitaminT** » Sun Mar 07, 2004 1:18 pm

Yeah I am going to try to get a SS mani. The way I look at it I could get 2 SS Autochrome manifolds and rotate them out when they crack. Sure you have sucky labor to exchange it, but they have a lifetime waranty. Although I think the autochrome mani's suck I have heard of issues with all of them (including the $750 JIC) so I am going cheap.

Now I just have to figure out how I am going to run the dump tube. I guess I will have to have a custom O2 housing made or just "dump" the dumptube in the atmosphere.

Post by **robbbby** » Sun Mar 07, 2004 1:18 pm

If you are looking at the SS autochrome one, have a look at the enjuku one, same price, doubt there is a warranty though.

Post by **VitaminT** » Sun Mar 07, 2004 1:18 pm

I have seen it. Looks nice. The price is a little more than the SS autochrome, but the enjuku is probably worth the difference.

Website · Post by **s13sr20chris** » Sun Mar 07, 2004 1:18 pm

the 25r and s15 data is not really comparable because it is under different circumstances. mike k said the dp was tuned very conservatively and running on 91 octane. the others were tuned by secret services, on 93, and prob had more bolt ons. im not sure. i believe the "transient response" may make the dp worth buying for me.

Turbo decision help

Turbo decision help

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