MONKEYmark Posted August 16, 2002 Share Posted August 16, 2002 hi was chatting to a lad from work today and i found out he used to work at a turbo place where they refurbish and upgrade turbos. he worked there 4 and a half years.he is getting some info on turbos and price of upgraded turbos for me. have got a all in one downpipe and have hit 1.5bar, i know its bad shit to do it so was thinking about upgrading turbos.i have a fmic on order and been told to run no more than 1.3 bar with it fitted.if i get upgraded turbos will i have to upgrade fuel on 440cc inj on my j spec to uk or better.i know i have to sort boost problem out,got some alloy from work to try make a restrictor type gasket to get boost down to about 1.2 bar if i can.i know i should get the cw pipes what a lot of you seem to use on here.got 3 days overtime so will look into gettin cw pipes and a couple of small bits to check fueling out with chris w. will the alloy be ok or would it just melt with heat.i also have a silencer that i will put back in to restrict gasses. what spec do the hybrids go to and the supra turbos are ct12 and the ct26 are mr2/celicas ?? would be good info if anyone else is thinking about upgrading to hybrids or big singles i know i have to sort fuel system out and fuel pump and cooling side too is there anything else we need to know, anyone like ian c who has hybrids have any info or advice for j spec cars and hybrids.or any specs to look at thanks for any info just curious to how much you need to do and prices, i know glen warren had hybrids fitted at dragon autosports the guy at dragon was showing me them before they were fitted to his car.and was ian c`s car the red supra with decals down drivers door, i seen him race paul whiffin and there was not much in it at 10 of the best. Quote Link to comment Share on other sites More sharing options...
eyefi Posted August 16, 2002 Share Posted August 16, 2002 where did he work? 1.5bar is bad, thats just short of 22psi. alloy is generally not very resistant to heat, especially trhe type of temps found in the front pipes of yr car, steel would be a better choice. if i where u id stick the blitz mid pipe and 1st cat back in until u get the cw catless pipes. generally, assuming a good working order, the stock jspec fuel sysytem is good to 18psi on the stock turbos. general concensus seem to be no more power is created after 18psi on stock blowers, just heat, and at 18psi some better charge cooling is wise, intercooler or water injection. if u get some more turbos to cure yr overboost (enlarged exhaust housing) they will spool slower. i dont think getting hybrids is a good solution to overboosting, its good for improving yr top end and reducing yr charge temps. someone with some first hand experience will have some better info. Quote Link to comment Share on other sites More sharing options...
Wez Posted August 18, 2002 Share Posted August 18, 2002 hello Someone correct me if I am wrong but the problem here is that the jap ct12 turbos do not have a large enough internal waistgate so when the wasitgate opens fully some air still flows over the impellers generating further boost which is where your boost creep is coming from. You could enlarge the waistgate but this would require a fair amount of work and could be a bit fiddly the other alternative is the restricted exhaust. I believe hybrids get round this problem as the waistgate should have been modded aswell, bit of an expensive route though, plus it is not recommended to run the stock ct12`s above 18psi. You should be able to get hybrids to match your use as there are lots of variations available. Hope this helps. :baa: Quote Link to comment Share on other sites More sharing options...
Ian C Posted August 19, 2002 Share Posted August 19, 2002 I'll try and supply anything I know (shouldn't take long then). Upgrading the turbos to hybrids will allow even more gas to flow and the boost would get higher! I currently have a huge amount of boost creep, hitting 1.4bar with the stock wastegate setup in place. I'm currently awaiting a restrictor plate from CW, as the annoying thing about boost creep is that it creeps! I will get about 1.1bar in 3rd, 1.3 in 4th, and will only reach 1.4 in 5th and 6th, and of course it takes quite a while to get there, so it's basically making the car not as fast as it could be, which is A Bad Thing So I suggest a restrictor plate first. I agree with the statements about 18psi being the efficiency limit of the stock j-spec turbos, anything past that is just heating the air and heading towards detsville. Hybrids will flow air up to at least 1.6bar quite cheerfully (as I've seen that briefly while messing with the boost controller and the car pulled like a train - not recommended, though!) so no worries on that front. A fuelling upgrade is essential to running hybrids, 550cc injectors and pump (and resistor pack!) plus a fuel controller to trim the fuelling to the correct levels. I don't know anything about the spec of mine, they are a mystery, and I don't know anything about different 'stages' of hybrids either. And I don't know what it cost I have swapped the turbos myself and it's a long old job, about three days worth of an amateur like myself. That was me at 10 of the best, and don't mention that bit, it upsets Paul However, his car was far from being finished so it was running low boost etc., but I enjoyed it as it was so close - very good fun! I've heard a lot about Glen's Supra but I've never seen it run, neither has anyone else I know of, so I don't know how quick it is etc.. I thought we would get a show at 10 of the best, but it just sat there being shiny. -Ian Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted August 19, 2002 Share Posted August 19, 2002 Ian, can't you control the boost creep with your boost controller ? Not sure which one you have. Quote Link to comment Share on other sites More sharing options...
Ian C Posted August 19, 2002 Share Posted August 19, 2002 I still maintain that's impossible until I see otherwise It's an Apexi job. Due to my inexperience with the unit and a real Doh moment when reading the boost pressure I accidently ran it to 1.65bar for one 3rd gear run, so the controller will cheerfully do it's job. But if it creeps to 1.4 (the record was 1.48) I'm hardly going to ferkle that down to 1.2 using it! And you can't set up a boost controller when you have creep, as the results vary from run to run thanks to temperature and the alignment of the planets and stuff. So, restrictor plate for me, although it's not the best solution it's the easiest and a trade off I'm willing to make at this point in time. I want a stable boost level to work from on setting up the controller, and it needs to be less than 1.4bar as I don't want to run that unless I have the old toluene tiger in my tank. -Ian Quote Link to comment Share on other sites More sharing options...
Nic Posted August 19, 2002 Share Posted August 19, 2002 Ian I suppose you've tried running with the boost controller turned off and you get the same boost creep? If you do then you'll need the restrictor, if not then it's probably the controller that needs setting up. Just a thought. Quote Link to comment Share on other sites More sharing options...
Ian C Posted August 19, 2002 Share Posted August 19, 2002 I currently have a huge amount of boost creep, hitting 1.4bar with the stock wastegate setup in place In order to prove it was the exhaust system and not the boost controller, I removed the solenoid from the loop entirely. The stock wastegate is doing all the work, and the stock hoses are in, so that they are all the right length. Still goes mad. -Ian Quote Link to comment Share on other sites More sharing options...
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