twin turbo

CptanPanic2 · Post by **CptanPanic2** » Thu Jan 25, 2001 1:41 pm

Seems to me to be overkill. You can more than enough boost with a single turbo. Anyway, space is tight already with one.
Brian

Sharkey · Post by **Sharkey** » Thu Jan 25, 2001 6:00 pm

The idea of twin turbos sounds cool, but you'd have to run very small turbos to spin each one up using the exhaust from only two cylinders. Room shouldn't be a factor if you model it after CB Performance's hide-away system, but trial and error costs (aka: R&D) will kill you.

aturbolvr · Post by **aturbolvr** » Thu Jan 25, 2001 11:18 pm

i want to twin turbo my bug.... anyone have any experience, or pic, info??

John Massengale · Post by **John Massengale** » Fri Jan 26, 2001 6:37 pm

The purpose of useing two turbos is to reduce turbo lag (the time it takes to get the momentum of the turbine spinning fast enuf to create boost) The Porsches use 2 turbos to reduce lag time because 2 small turbines speed up faster then one big one. If you wanted to turbo a bug , even with a Type 4 you are gonna need a lot of cubes. I think that for as big as you can get with a type 4, one turbo should be big enuff. You can get rid of Lag time other ways instead. Just my thought, I would look cool as hell though, a twin turbo bug, good luck have fun in the quest of reliable power, John

eric · Post by **eric** » Sat Jan 27, 2001 1:08 pm

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by John Massengale:
If you wanted to turbo a bug , even with a Type 4 you are gonna need a lot of cubes. <HR></BLOCKQUOTE>

Many people have perfectly reliable stock engines with turbos

------------------
Eric
'72 SB

aturbolvr · Post by **aturbolvr** » Sat Jan 27, 2001 2:57 pm

thanks for all the info!! anyone ever heard of the 1.5 twinturbo Honda F1 car??? im thinking of...1 turbo for each side. make the bottom end strong, 92 or 94mm pistons, 69mm welded, full circle crank. tons of flow in the heads, 42 or 44mm in, 38mm ex. Lots of airflow means lots of HP. i maybe wrong, have been before! but sure worth a try!!

John Massengale · Post by **John Massengale** » Sat Jan 27, 2001 5:18 pm

What I ment with the lot of cubes thing is that you would probobly want to have a lot of engine volume to make the twin turbo worth the money and the hassel. You got more weight and a lot more money involved with twim turbos. I just figured that with all the success with single turbos on bug engines, considering they already have high boost and you can cure lag. I know people turbo stock motors but you can bet they are using one turbo. Cool, John

volkaholic · Post by **volkaholic** » Sun Jan 28, 2001 6:53 pm

If the goal is to eliminate turbo lag, you have 2 other options, both using one turbo. 1- turbo + nitrous. 2- a variable vane turbo, this gives you the effect of having a "small" turbo at the bottom end, then as flow increases, the vanes rotate & give you the effect of having a large turbo at the middle & top end. Sounds great, but I've never actually tried one. I plan on it for the next project, turbo type 4 in a bug. Finally, how about variable vane turbo + nitrous?

Derrick from NC · Post by **Derrick from NC** » Tue Jan 30, 2001 3:10 am

How about two small turbochargers from a motorcycle application?? A pr. of turbos sized for a 1100cc motorcycle engine & a small dia. exhaust 1-3/8" or 1-1/2" would seem to be a good match for a 2L plus type 1 or IV engine. The small exhaust would help the turbos spool up quickly. I would go with as high as c.r.(8.5:1) as possible, go conservative on the cam and boost(max. 6-8lbs.) Should make for a very powerful and versatile engine that makes excellent power immediately off idle thru 6000rpm. I think a even better idea would be to go the sequencial turbocharging route where you have (2) turbos in series. I think the Toyota Supra uses the method. Basically a smaller turbo is sized to begin building boost quickly off idle then a larger turbo takes over at around 4000rpm when the smaller turbo dies out. I think plumbing this type would be easier than the twin turbo route

Stephen · Post by **Stephen** » Tue Jan 30, 2001 4:03 am

Why not get a ceramic ball bearing turbo off a Nissan 2L (RB20). Their good for 300hp but due to the very low reciprocating mass, you can have a big turbo without the lag.