Why not make it a twin-turbo?
Evolving Member
Joined: Jul 2004
Posts: 130
Likes: 0
Twin turbo means twin headaches. Having a small and large turbo is a waste of money. If you can launch correctly then it wont help much for most low mod cars.
Its a great idea, especially on the FQ400 and in that range.
Its a great idea, especially on the FQ400 and in that range.
Originally Posted by sabastian458
i agree with everyone so far, displacement size is a major factor, if the engine can spin a single turbo better use it, a small 4 cyl, a normal everyday driver, cant run two turbos, it will not beable to produce enought exhaust gases to spin two fast enough to make the same boost pressure as the single kit, v style engines can do so because they use 3 cyl to run a slightly smaller turbo. just look at the vr's of the past. in short to have a twin turbo i-4, it would have to push serious exhaust gases and have tons of room for the two turbos plus piping.
I built a twin turbo system on a 1g. Used two 2g T25's. Was hard to fit in the car with the header, O2 housings and intake plumbing. Oil and water lines, wastegates. Performed better than a 20g setup, especially on the top end. Did it just to see if I could make it work. Idled and drove great. Spoolup was a little slow, but by 4000 it was making good power. Pulled past 7500 with no boost drop. Don't see it fitting the EVO that well. Radiator is too close, as is on a 2g. 1g had a little more space to work with.
Problem I see with all this big turbo upgrades for the EVO are the headers. Car after car I see has stress cracks in the collector or at the exhaust port flange. Need a good cast manifold. Hard to make power if exhaust gases are leaking.
Problem I see with all this big turbo upgrades for the EVO are the headers. Car after car I see has stress cracks in the collector or at the exhaust port flange. Need a good cast manifold. Hard to make power if exhaust gases are leaking.
Here's a nice Twin Turbo setup... don't know if it'll fit the Evo VIII though:
http://www.jmcnetworks.com/ebay/twinturbo/twinturbo.jpg
http://www.jmcnetworks.com/ebay/twinturbo/twinturbo.jpg
Originally Posted by El Boricua
Ok, let me add to the ignorance... The twin turbo systems on the Supra's and RX'7 are secuential, with a small turbo spooling at lower RPMs and a larger one at high RPMs. I think that's the setup you are talking about. As for the 350Z , it is just like my VR4, been V format it is easier to put one turbo on each side of the V. Now, talking about the 3000GT VR4 , the one I really now cause it is the one I have, I can tell you that we (and now talking about the 3000GT comunitty) install big turbos in our cars, as big as 20G and maybe larger(for some few thrill seackers) but larger than that you start having problem with lag.
Now my mechanic is thinking about installing a twin turbo setup to his MR2 , he was thinking about the advantage of faster spool of the small turbines. While a big turbo is tougher to get to full boost, a small turbo car reach that limit faster, but then again the limit by the size of your turbos.
Smaller turbos are better for faster spool like road race, Rally type races, bigger turbos are more suited for drag race and top speed test.
Just my opinion...
Later,
Now my mechanic is thinking about installing a twin turbo setup to his MR2 , he was thinking about the advantage of faster spool of the small turbines. While a big turbo is tougher to get to full boost, a small turbo car reach that limit faster, but then again the limit by the size of your turbos.
Smaller turbos are better for faster spool like road race, Rally type races, bigger turbos are more suited for drag race and top speed test.
Just my opinion...
Later,
Originally Posted by Early EVO
I built a twin turbo system on a 1g. Used two 2g T25's. Was hard to fit in the car with the header, O2 housings and intake plumbing. Oil and water lines, wastegates. Performed better than a 20g setup, especially on the top end. Did it just to see if I could make it work. Idled and drove great. Spoolup was a little slow, but by 4000 it was making good power. Pulled past 7500 with no boost drop. Don't see it fitting the EVO that well. Radiator is too close, as is on a 2g. 1g had a little more space to work with.
Problem I see with all this big turbo upgrades for the EVO are the headers. Car after car I see has stress cracks in the collector or at the exhaust port flange. Need a good cast manifold. Hard to make power if exhaust gases are leaking.
Problem I see with all this big turbo upgrades for the EVO are the headers. Car after car I see has stress cracks in the collector or at the exhaust port flange. Need a good cast manifold. Hard to make power if exhaust gases are leaking.
