N/M, I'm an idjit, he changed to twins but not stock twins.

What is the biggest set of twins you can get?

That's much like asking "what's the biggest single turbo that I can put on my engine?". I guess it depends on how much room you can make for them. After that it's up to your wallet, turbo know-how, porting know-how, and imagination. But I'm sure a couple of really freakin' huge turbos could be shoehorned into the car for a photo shoot. https://www.nopistons.com/forums/pub...DIR#>/wink.png Having them actually spool up, well that's another issue.

What's the smallest single turbo I can get? For, say, a 25-50cc engine?

General rule of thumb - if the turbo is the same size or larger than the engine it will be attached to, there will be severe lag. https://www.nopistons.com/forums/pub...DIR#>/wink.png

I was thinking of a big turbo then a littler turbo so spool is quicker.Any suggestions as to what 2 sizes to go with.

I think that would be hard to do right if you went with different size twins. I'd imagine two different size turbos (one of each exhaust port) would create uneven backpressure so you'd end up with one exhaust port having more back pressure than the other. Which would prob be a pita for tuning if you wanted to really tune it right. Might be wrong though, thats just the first problem that came to mind.



If you want something like that stick with the seq set up but maybe do Robs simplification to the set up to get rid of the rats nest. You could make up to around 380rwhp range like that without to much problem.....thats good for some mid 11's in the 1/4



STEPHEN

You can simplify the twin turbo setup without going non-sequential? Link to the info on that?

hes talking about going non-seq.

I was looking for more then 380whp.Would I have to go single to meet the 400 an up range?