CT-12s on a 7M

[logan]

looks like in parallel theres more torque sooner, how is it laggyer? looks like it comes in harder in sequential but sooner in parallel. unless you just got the colors backwards.

What a dyno doesn't tell you is the time it takes to rev . The more tq. you have earlier in the rev range to quicker you are going to rev . For example , stock twins have 300 ft.lbs @3000rpm while the parallels have about 175 @ 3000rpm . So the stock sq. twins will reach peak torque faster than the parallel twins , even if peak torque does comes on a little latter .

Stock twin MKIV's are not laggy cars at all , i can't imagine toyota would have gone to all the trouble of the sequential system to have it spools slower than simple twins or a simple single .

If you are in the mood for fabricating you could always attemp to make a sequential system by using exhaust cut outs . How you switch between them though is the tricky part . Toyota AFICR used both a pressure and rpm based system . There was a long thread on supraforums about some people trying to do just this , but it faded away .

 

[ma71supraturbo]

People have made 400+ on the aristo twins on a 2jz-gte so it shouldnt be too hard to make that on a 7m, especially when I get some 264s.

A few people have made 400+ on ct26 as well. JBLmk3 comes to mind. I wouldn't recommend pushing either twin ct12s or 1 ct26 to that level, as I doubt the turbos will last long...

 

[foreverpsycotic]

If you want a twin turbo 7M, run twin Mitsu 16gs, or twin T3-Super 60s, imho.

Twin CT12s is a waste of time.

opinion noted, but twin 16gs would cost me too much, same with the super 60s. the main idea is to do this for under 1k, and thats entirely possible with aristo twins, and would also put me in the HP range i wish to achieve.

If i was going to toss that much money at a 7m, a 61-67mm t04 would be on.

 

[tte]

If you are in the mood for fabricating you could always attemp to make a sequential system by using exhaust cut outs . How you switch between them though is the tricky part . Toyota AFICR used both a pressure and rpm based system . There was a long thread on supraforums about some people trying to do just this , but it faded away .

If you smart enough you could make a electronic controller and experiment and program the controller to do that. Similar to the one used for variable vane turbochargers.

Im my previous job we repaired a electronic controller for electric turbos for turck racing. Cant remember all the details but I wish I had learnt all the scehmatics for it.

Cheers,
Roy

 

[Poodles]

yeah, the stock twins that everyone throws away are cheap and plentiful...

There used to be a manifold floating around on ebay to put the stock twins from the MKIV on the 7M, was gonna pick one up but I can't find em anymore...

 

[starscream5000]

Isn't the OBX twin turbo mani for the 7M flanged for mitsu turbos? It has the three bolt pattern that mitsu's have, but it may be different looking in person...

 

[foreverpsycotic]

yeah, its flanged for 20gs, and requires alot of work to use.