Advise: building a b235r viggen motor to handle a GT30

You really don't need much past forged pistons and connecting rods, the rest of the car is perfectly able to hold the types of power levels you will see. I would go with JE pistons, ARP head bolts, and it would be wise to get at least a T5 cam to help the engine breath in the topend.

Other than that, the other important factor to a reliable high horsepower setup is to get plenty of fuel so you might want to check out a Walbro 255 or more along with some 630cc Siemens Dekka injectors.

you dont need rods, just pistons.

bosch 044 > walbro.

saabkid37 said:

bosch 044 > walbro.

Click to expand...

FML. Wish I bought it from the start. And I would go with the 80# Siemens over the 60# ones just because the price is hardly any different. I paid $190 or $200 shipped for mine from lightningforce. No reason to under injector yourself.

Well I'm planning to do a refresh on the engine while i have the thing apart and obviously throw forged internals at it... and ARP headbolts... should i do the balance shaft tensioner delete? Anything else internally in the motor?

I'm going to do the transmission as well... should i use something bigger than the spec stg 3 clutch?

Thanks alot guys...

comtrang said:

FML. Wish I bought it from the start. And I would go with the 80# Siemens over the 60# ones just because the price is hardly any different. I paid $190 or $200 shipped for mine from lightningforce. No reason to under injector yourself.

Click to expand...

these days you could really just run the id1000's and they will probably idle better than the 80's anyway.

So which injectors should I be sourcing?

whats the power goal.

400ish (+) i was hoping...

buy my b204

saabkid37 said:

these days you could really just run the id1000's and they will probably idle better than the 80's anyway.

Click to expand...

no idling issues on mine.

You're more likely to run out of fuel pump before injectors. I can't speak for the id1000's but I don't have any issues with my Siemens 845cc ones. If you're saying 400bhp then you'll be fine with a set of them and a Walbro 255. 400whp, I would go for a bit larger fuel pump.

typically, as you get very high in injector sizing when you have to lower the duty cycle you get crappy spray and it can cause issues.

i dont have any personal experience with the siemens stuff, so if yours works it may not be an issue.

the id1000's and id injector line in general (the ones nick t sells as bosch 1000's) have been shown to even make more power on the dyno with phenomenal spray pattern and low duty cycle control. it would also insure you never run out of injector further down the road.

same thing with the pump, i wouldnt waste a step on a walbro. their high pressure/high draw performance does not impress me.

I've already got a walboro 255 pump ready to drop in, what would be a better option?

Then its down to paying $420(ish) for these id injectors or runnin siemens for $200(ish)?

Where can I source one of those?

just google around, there about as easy to find as the 255's

is this an external inline fuel pump? Or does it mount in the same manor as a stock fuel pump?

it can be fitted in the stock housing just like the walbro

Definitely wish I had gone with a Bosch* to start, now I've got to just add the inline Bosch. They're about twice the price but it's flowing about 50% more at any given pressure. I THINK I was told way back that the Walbro is good to something like 450bhp for us.