Ok so I am starting to look into/ research upgrading my turbo. I love my gt30, but I want more. I am looking into going with a HTA35 or similar turbo.

What I am doing with the car is mainly daily drive, with minimal to occasional track useage. Strictly pump gas (91-93 octane with 10% ethanol), very very rarely race gas. (Sunoco Leaded 110 if race gas is used)

A quick rundown of what I am running;
2.3l stroker (8.5:1 pistons), BC280's, total of .030 milled between head and block, Excedy Twin, FIC 950's, Single 255 lp hp pump, HKS ignition amp.


I already know I will need a double pumper. I am highly confident I can manufacture my own. I just need to find the correct AN fitting for the pump housing.


What I am unsure about is this:
1) Will I need to up my injectors? If so, to what CC?

2) Will my Excedy hold up to the HTA35? (or equivlant)

3) Will my stock fuel pressure regulator keep up with the double pumper?

4) Will I need a stronger ignition?
4b) If so, will the MSD GM 2 tower coils be suffecint?

 

if your looking into a bigger turbo like the hta35 look into the hta86 its making awesome power - and with the double pumper im not sure if the stock regulator will work but if your going to start upgrading the fuel system might as well in the process, also if your going with the double pumper go with 1200cc injectors they will support the pumps just fine. the twin disk should hold up depending on the power your looking to make with the setup. I dont know if you need to upgrade your ignition but if your looking to Buschurs unit works great from what i understand - i dont know much about the msd because i have seen many evos run with them i hope the info helps and good luck on the setup

 

You should upgrade to 1200's(ish), maybe 1250's or whatever.
The exedy should handle that power if anything can. I've seen a lot of people upgrade FPR's at your projected power level. I do not know if they have seen benefits that the stock unit could not produce.

As far as the ingition goes, a really smart upgrade would be the sparktech/buschur COP set up. Expensive, yes. Most of their cars that run that much power use this system. I have yet to see anything that outperforms it for the evo, but I could be wrong. The 35r in the .63 a/r exhaust housing is another popular option that makes really good power.

My next turbo will be the Precision 6262.

 

The .63 a/r is ok, but produces a lot of backpressure at higher boost levels. I personally love twin scroll designs, they tend to spool much faster than their open housing counterparts. Plus since you already have the extra displacement a T4 type twin scroll housing will have both lower backpressure and faster spool time making it the best of both worlds. Just something to take into consideration.

 

And now for the good news . . .

If you are truly using strictly 91-93 octane, you should be able to get by with your present injectors and even your single 255lph pump, so long as you rewire the pump and ground as you would an audio amp. That combination has proven to be worth somewhere around 600whp, which is plenty.

If you do home-brew your own double pump assembly, the factory FP regulator will be ok, but the return system probably won't keep up. If you retain the marginal factory pump wiring, it might. The potential problem is that without a pressure gauge (which typically requires an aftermarket rail), you wouldn't know if your home-brew dual pump system is creating a pressure issue. But then again, if you can be satisfied with the ~600whp a single pump can be made to deliver, it may not matter.

You probably won't need an ignition upgrade if you keep the plugs gapped to something like 0.024" and run no more than around 30psi boost.

I'd suggest just making your turbo swap, rewiring the pump, and see what you get out of it before spending on upgrades you may not actually need.

 

Ted B made a lot of good points. I recently spoke to David Buschur about my planned upgrade path and as much as some people dislike him as a person, he is very smart with what he does to his Evo and those coming in and out of his shop. He told me that the stock FPR is good up to about 550-600whp on his dyno. I have one of his double pump setups on the way so when I put it in I will tell you if it over runs the stock return line.

Josh

 

I think that the issue with overunning the stock fuel return line really only applies to a double pumper setup that has both pumps running fulltime. In contrast, with the BR staged double pumper there will be only a single pump running at idle, low throttle positions and low boost situations.

EDIT: I think that the second pump comes preset from BR to kick in somewhere between seven to eleven PSI(I don't remember the exact number offhand). To me that still seems a bit too low of an activation level. I used to like triggering the second pump above 12 PSI.

At any rate, check with Buschur. Because with a staged double pumper there should be no need for a larger than stock return line.

 

I have attempted the Hot wire route before. My tuner said that I was actually getting about .5 a/f leaner after the rewirings.

Here is a link to my thread about my issue. https://www.evolutionm.net/forums/ev...-hot-wire.html

Any suggestions as to what I may have done wrong?

 

Bump for hotwire question.

I think I am deciding towars the B&W S366 (maybe it is the S361) Twin scrol with the 1.06 housing.

I already have a aftermarket fuel rail, with gauge. So I can see what my baseline F/P is. I currently run a .023-.024 gap, 2 step colder plugs changed at every 5k miles. And i am also running 32-31 peak psi, taper to 29-28 psi on pump.

 

Wire it like the third diagram in the other discussion and see what you get. I'm not sure I see how it can go leaner. Something doesn't seem right there. Be sure about that.