Hello, on an e55 amg w210 v8 m113 5.4l comp ratio stock 10.5. I would like help in choosing turbos.

I hesitate between a single ebay gt45 t4 or twin ebay gt35 t3.

Gt45 T4 spec:
Comp trim50: ind 69 exd 98 a/r 0,66
Turb trim77: ind 88 exd 77,5 a/r 1,05

Gt35 T3 spec:
Comp trim57: ind 61,5 exd 81,5 a/r 0,7
Turb trim84: ind 68 exd 62,4 a/r 0,63

the configuration gt45 seems more reliable to me but I do not see how to pass a pipe 4 "for the exhaust, unless going out directly in the wing. And it would be noisy. the double gt35 configuration seems simpler to me, the turbos are smaller and pass under the hood without much difficulty, the 3 "downpipe pipes should pass, and I can keep the original appearance, no cutting in the wing, double final output amg. I would like to know what you think of what each configuration would give rpm level, start of pressure, full pressure. I was thinking of going between 7 and 12 psi. I hesitate to put or not an intercooler, I ride the e85 only. I'll probably go with 2 big fuel pumps.

It's a streetcar, daily car.
I want 500 whp mini and streetable.
I'm in France, thanks.

 

Between those two, the GT35 would be my first choice for sure. Given the packaging issues, you will probably be best going with twin T3 based anyways.

 

currently in n / a, the maximum power is at 5500 rpm and the maximum speed at 6000 rpm. I also think that the double gt35 t3 a / r 0.63 will take off sooner. Do you think they will bring good power at 5500-6000 rpm? I also saw ebay twin gt30 t3, are they too small for high speed? 3 "down pipes for the gt35s are ok?

 

Oh yeah. Without using matchbot to make sure it's perfect, my gut tells me twin GT35 would be really good on that engine.

 

what do you think a twin gt45 would look like? I found a mounting on equivalent displacement v8 but it was an American engine, it speaks of positive pressure from 4000 rpm. Do you think that a twin gt45 assembly, with e85 and without intercooler, stock engine, 8-10psi max, what would it give? intake temperatures rise without intercooler but the e85 delays detonation and mounting without intercooler would surely charge a little earlier ... ???

 

I am afraid of the reliability of the gt35, the gt45 seem to me more reliable. And the twin mounting is simpler, staying at low pressure, I could keep the downpipes in 3 "for a strictly original exterior appearance.

 

I agree with Disney a pair of gt35 sized turbos would be your best bet. You could give VS racing a call and ask what they think they might have something similar in size to the gt 35s if your worried about reliability. They will pull to 6 grand.

 

I'm in France, I order in Europe, I really hesitate between the twin gt30 / gt35 and the single gt45. Can I go with a 3 "downpipe on a gt45? it's the only way to get past the exhaust, otherwise I have to go out in the wing ... And I don't want to.

 

I'm just wondering if I won't be having back pressure concerns with a single 3 "downpipe on the gt45, about 8psi of boost. I think it's good but I'm a novice.

 

I think restricting a 3 "dp will only work at high pressure. My assembly being at low pressure, in order not to break the engine, the wastegate tared at 8-10psi evacuated largely soon enough before feeling strong against pressure. If you agree, I limit the costs with a single turbo gt45, a single line and discharge of oil, and a single dp of 3 "to the rear. I'm thinking of going directly from the compressor to the intake, without going through an exchanger. I'm driving on the e85. I ask a lot of questions, but I ask for your experience. Thank you.

 

I have no idea why you'd think a GT45 more reliable than a GT35. I stand by my previous comments in that twin GT35 would be better on this combo.

 

x3, I also agree with Disney.

 

Ok go with 2 gt35.

 

I'm going to go with 2 gt45, I looked at the mustang 351 twin gt45. My engine is 331ci on the e55 amg but it comes out 350whp stock. Better distribution. I will have a cool daily mode without turbo. and a full power wot mode from 4500 to 6000 rpm. 700whp objective at 0.8bar-1 bar = 12-15psi. I already have a GT45, I buy a 2nd and I feel it more reliable than the GT35.

 

I don't think you're going to be happy with it, but please share the outcome. The 45s have huge turbines for twins, and 12-1500 hp worth of compressors . Why do you feel the 35's are unreliable?

 

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Like Mnlx said before you won’t be happy .why would you want to not have boost in a more usable part of the rpm. You know how you get a cool daily driver mode ? Let up on the gas pedal and put around. When you want full power mode you sent the floorboard with the accelerator. No need to reinvent the wheel. You should size the turbos to the hp your looking to achieve not overshoot it by twice the amount.why not sell the turbo you have and buy turbos of similar size to the gt35s that you find reliable. I would do a search on gt35s on this forum of actual people who used them then read amazon or whatnot reviews who can’t tie there own shoes lol.

 

Maybe autobahn cruiser?

 

The problem, by dint of reading the topics on the turbos, you end up getting lost, especially when you start like me.
The twin gt45 would be very laggy but capable of good power between 4500 and 6000rpm.
The twin gt35 t3 .63 (exact specifications in my first message) would it not bring too much back pressure? Some say that .63 in t3 is a bit small ...?
It is a low boost and low cost application.
I continued the research for the other parts, I found 2 wastegate 38mm with 8 psi spring. Maybe 12 psi would be better?
I have to find the compromise between boost and not break the engine (ratio 10.5) ....
I was also interested in timing. If I leave on my N / A timing, it will be necessary to decrease the advance from 5 psi approximately is that it?
I plan 2 external pumps (original assembly 1 external pump), I think to take 2 deatschwerks dw350iL pumps.
80lb injectors.
Do not forget that I only ride on the e85, I put an intercooler or not? I read pros and cons, for = gaining charge time, cons = iat high and not controlled ...
For tune, do I have the origin reprogrammed? or am I going to a programmable calculator like megasquirt? Lots of questions ahahah ... Turboforum is very interesting and very rich compared to what we find in France ...

 

I think you are right, the gt35 t3 little a / r would certainly be more effective for a low boost application.