What turbo to achieve 350bhp?

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GP82

Member +
The compressor wheels in turbos have either the radial or backswept blades, These are the trick blade angles. The radial bladed comp wheel will be the fastest to respond rise in pressure, but less efficient upstairs. Backswept blades will slip more before it creates pressure, but more efficient upstairs. This is what i was getting at with the MHI, IHI vs the new and old ballbearing turbos!
 
Ted

Ted

Member +
GP82 said:
Gord R, are you still in the search for the quest to find the best hill climb turbo… ha ha.

Well if you are looking for any sort of response coming out the corners to net you a good trap speed down a straight in addition with a strong midrange power and decent top end, the last thing you want to do is bolt on a Garret turbo!

Now I’ve not anything against the Garret turbos and I’m not saying their a bad charger, they are good for the right purpose. What you need is a very well matched Evo or Subaru turbo, mhi or ihi. The Garret will only be good for top end in my opinion because of it’s design where as the evo or Subaru turbo will net you good response and strong midrange power which I think is what you require. No doubt the garrett chargers are good for a drag, top end or top speed setup.
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x2 even the smallest gtx seems a bit big for a 4e unless you are drag racing and would use nos to help spool. strange you guys wanna blow a grand on a turbo with no proven results on a small engine
 
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Skalabala

Member +
Ted said:
x2 even the smallest gtx seems a bit big for a 4e unless you are drag racing and would use nos to help spool. strange you guys wanna blow a grand on a turbo with no proven results on a small engine
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And you just had to say something realistic :(
 
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Ally Dawood

Member +
Hey Mate .
On a 4e build with a bigger turbo youll get alot of lag and what iv seen the MAX you can reach on a 4e is about 310BHP...I would rather suggest you to go for 5E youll get less turbo lag and the max ull be able to reach will be around 500+BHP...
 
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AdamB

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The highest bhp 4E over here is 440bhp, there is nothing wrong with getting the power from an E series engine, but you just have to factor in what the car is going to be used for. Spuddy is running near enough 600bhp on a 5E.
 
sam_glanz

sam_glanz

Member +
Interesting thread, I agree with many people on here about old school turbos, I've yet to see anyone design a twin scroll manifold or anything for the starlet(may be there is, but I have not seen it), with modern technology, turbo chargers available that are advancing every day, we're getting left behind lol,

I know many cosworths running twin scroll manifolds with the latest garret and borgs, it's an old car but it's keeping with the times, I'm not some secret ford fan but I think there going in the right directon, not stuck in the past because it's easier to stay with an old truck turbo because it makes big numbers, and proven.

I don't want the starlet secne to fade away in the back ground.




I'll also add I'm running a gt2860rs on a 5e I'm making full boost @1.5 bar by 3900 not fully mapped by a pro yet just a base map, and if anyone else is running a gtrs series turbo and feel hard done by with the gtx cuming out, garret can offer the front housing being machined and the new billet wheels ect, in affect turning it Into a gtx
 
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AdamB

Member +
The problem with twin scroll manifolds is that essentially you are blanking off 2 cylinders at a time. Not so bad on a motor with 2000 + cc of engine capacity, but on a small 1300 cc engine its going to struggle to spool a large turbo.

Sam its good to know your making 1.5 bar by 3900rpm as i'll be running the GTX series of the 2860 turbo, so hoping to get spool a little sooner with the lighter billet wheel.
 
sam_glanz

sam_glanz

Member +
like I say mate, it's not full mapped, if I'm honest I think it could spool quick as it building boost it's quite rich and you can feel it under foot bog down slightly if you know what I mean? so the gtx seems like its good to produce some nice figures, not just bhp but spool times as well :)

I see what you mean about the twin scroll as well, I didn't think about the cc of the engine apossed to the number cylinders, I wouldn't still like to see a twin scroll manifold results
 
Ted

Ted

Member +
twin scroll saw done over here on a 4e glanza. spool up was just ok, ran out of puff up high for some reason acc to the guy who built the manifold and tuned it.
 
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AdamB

Member +
I think it matters more on a twin scroll setup that you run equal length runners with mandrel bends. I don't think its worth running a twin scroll setup as there are newer technologies which will give better results on small capacity engines.

Was it an Evo TD05 Ted? What kind of power did it make?
 
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AdamB

Member +
They are deffinatly a more top end turbo, but with the newer GTX, borg warners, precision turbos and probably more, theres no need to run a twin scroll setup on a small capacity engine when you can get a larger powerband from the above turbo manufacturer's.
 
Phil

Phil

Super Moderator
Old thread, but lots of great info.

tell me, any info out there on an IHI Turbo - Spec RHB52 ? subaru fitment.

Phil
 
5e colin

5e colin

Member +
yummy just went tru 7 pages my forged 5e on tdo5.20 did 278 bhp at 1.2 bar so it would be achievable on a 4e running 1.6/1.8 bar but thats the limit of the turbo to
 
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AdamB

Member +
It seems that way mate, from what I gather it uses the largest IHI turbine P20 housing but yet it only produces 280bhp at 1.4 bar on a 2.0 L motor, which we can get that sort of power from the td04 at the same boost levels. Seems like it could be around the td05 kinda range.
 
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