rover tomcat

[jonnyshaw49]

hi can anyone tell me the turbo inducer and exducer sizes as im gettin a turbo made up from adam l hopefully in the next week or so and he said it will have the same size wheels as the tomcat turbo but he doesnt have the measurements off hand,also just been reading a thread on the tomcat on here and bushy was running a tomcat style t25 to hit 247 bhp and just over 11 seconds, the thread mentions a .49 to be best but what is .49 on the garret site it only mentions inducer and exducer sizes and is the .49 the a/r? thanks

[Markey Mark (BD)]

The .49 is the A/R of the housing mate.

I'm not too sure what the inducer or exducers are of the Tomcat turbo are.

Yeah Bushy used some sort of T25 on his car, had alot of engine work to go with it too so that how he managed 247bhp.

[jonnyshaw49]

what bhp is possible with a t25 and standard cam mate?? 200??? where could i find the wheel sizes for the tomcat???

[Markey Mark (BD)]

what bhp is possible with a t25 and standard cam mate?? 200??? where could i find the wheel sizes for the tomcat???

Are we taking about the spec of T25 your getting?

I can't see why you can't get close to it with it set up correctly.

[jonnyshaw49]

yeh mate on about the t25 im getting adam l said it will have the same wheels as a tomcat , he cant do me the same turbo as u the t25/t28 he said it would be £650 so hes doin me a t25 so wondering what power it would give out thats all. what psi will be needed on a t25 for 200 bhp??

[Markey Mark (BD)]

yeh mate on about the t25 im getting adam l said it will have the same wheels as a tomcat , he cant do me the same turbo as u the t25/t28 he said it would be £650 so hes doin me a t25 so wondering what power it would give out thats all. what psi will be needed on a t25 for 200 bhp??

Thats cool, T25 will be good enough for what you want.

Its abit hard to say really mate, there's no set boost pressure for certain amount of boost. I'm sure you'll be happy with it as he does dish out some bloody good turbo's.
Best thing to do is set it to what you feel happy with and then see what power its putting out.

[jonnyshaw49]

thanks for the reply mate all i was wondering though is ,is a t25 good for 200 bhp like if i get a bigger cam eventually or will it be running out of puff up the rev range?? thanks

[Markey Mark (BD)]

thanks for the reply mate all i was wondering though is ,is a t25 good for 200 bhp like if i get a bigger cam eventually or will it be running out of puff up the rev range?? thanks

With a T25 rear wheel and .49 housing i don't think you'll be running out of puff high up in the rev range.
What sort of boost you want to run?

[jonnyshaw49]

well im wanting around 200 bhp but not too much lag lol, just a good compromise between them.i will be doing the track day at rockingham etc and maybe any nearer to lancashire. but i have alot of mates with subarus's, fiesta rs turbos, 106 gti's modified starlet turbos, want to be sumwhere up at the top of them lol, dont want gtis passing me especially

[jonnyshaw49]

well im wanting around 200 bhp but not too much lag lol, just a good compromise between them.i will be doing the track day at rockingham etc and maybe any nearer to lancashire. but i have alot of mates with subarus's, fiesta rs turbos, 106 gti's modified starlet turbos, want to be sumwhere up at the top of them lol, dont want gtis passing me especially

[BluntyR5GTT]

well if you get passed by a gti then summat is seriously wrong fella rs turbos on the other hand are a diff story my old rs would eat my gt as it stands

[Markey Mark (BD)]

well if you get passed by a gti then summat is seriously wrong fella rs turbos on the other hand are a diff story my old rs would eat my gt as it stands

Something wrong must be with your gt then for RS Turbo's to pass it! :cooter:;) Should pass then easily

[BluntyR5GTT]

Something wrong must be with your gt then for RS Turbo's to pass it! :cooter:;) Should pass then easily

lol my old rs was 212bhp mate very lairy to say the least and i wont state what the top speed was else it could get me in trouble ;)

[markey b]

top speed is irrelivant, its how quick you get to the speed limit that matters :agree:

[Markey Mark (BD)]

lol my old rs was 212bhp mate very lairy to say the least and i wont state what the top speed was else it could get me in trouble ;)

Yeah keep quiet just incase:D

Just for quick comparison, a 212bhp 5 gt against a 212bhp RS turbo, i got an idea which one would come out on top in a standing start sprint;)

[BluntyR5GTT]

of course the gt would win for sure not sure about top end tho as the zvh converted one i had was rather naughty

ooo i think we might of drifted slightly off topic for the guy here tho :laugh:

[rs250nut]

lol my old rs was 212bhp mate very lairy to say the least and i wont state what the top speed was else it could get me in trouble ;)

My M3 is capable of 155mph limited and its been on the limiter:cooter:

[jonnyshaw49]

my mates rs turbo has a t2/t25 and seems slow compared to my gt,but were swopping his engine to a mk1 fiesta coz his shell isso rusty, so i want the t25 so i can wipe the floor with him lol, my mates 106 gti are in a mk1 all stripped out with 809 cams and vernier, ported heads full stanless piper exhaust and manifold, pipercross filter and diff and running 170 bhp so want to be quicker than them

[jonnyshaw49]

can anyone tell me which of the 2 turbos will produce the most power but not be too laggy using standard cam

turbo with front a/r .48 and exhaust .35. turbine wheel 53mm inducer on 62 trim. full t25 with machined t2 exhaust

or
T25/2 with .47 rear t25 front & core, 55 trim comp wheel


thanks

[jonnyshaw49]

anyone know?????

[Markey Mark (BD)]

Its not so much which one will produce more power its which one will flow more air efficiently.


The one with the smaller rear wheel will be the least laggy, just thrying to work out which one from what you wrote

Is the first one a full T25 with a .35 T2 turbine housing and the second is a T25/T2 with a .47 T2 housing?

[jonnyshaw49]

yeh the first one is a full t25 with t2 .35 rear housing thats from adam l hes not sure on the comp wheel size yet, the second one is the one that steve l is advertising on behalf of cr turbos, on renault5gtturbo.com, they sell them at 430 plus vat,maybe cheaper if you send cash recorded and insured, just wondering which would suit me better if i do have a standard or mild cam, which will flow more efficiently, if i take my rocker off would i be able ti check if the springs are standard?? or if i put a pic up on here sum1 could tell me, thanks

[Markey Mark (BD)]

The one from Adam L will suit you best mate ;)

Thing is with the cam in your engine, the valve springs maybe stronger but you may still have a standard cam in there, only real way to know is by taking it out or measuring it in the engine from lift and duration.

[jonnyshaw49]

lift and duration:) never knew you could do that , how do you do it??? what is needed i know an old skool mechanic i could ask if you tell me how, thanks, so would the turbo adam l sell flow better and be good for 200 bhp on that spec? thanks

[Markey Mark (BD)]

lift and duration:) never knew you could do that , how do you do it??? what is needed i know an old skool mechanic i could ask if you tell me how, thanks, so would the turbo adam l sell flow better and be good for 200 bhp on that spec? thanks

Adam L's turbo will flow good enough for what you want from your mate. :agree:

Its a case of using a plunger dial and a degree wheel on the crank to see when the valve open and close's, for how long and how high it lifts.
There's an artical on here somewhere that explains in alot more detail

[jonnyshaw49]

thanks mate how much is the plunger dial and degree wheel to buy are they expensive as id probably only use it once lol, or are they handy for different applications?? when i get better at mechanicin lol

[jonnyshaw49]

could anyone explain to me the difference of them 2 turbos above??and which turbo is best for what?? for example one better higher up the rev range etc?

[5teve L]

A ran a 'Bu$hy' spec turbo from Adam, worked very well on my spec... over 200 easy, 12.78 1/4 mile with 14 stone driver..:laugh: Very strong turbo. gave it some real stick as well & it never failed on me.
On a side note the turbo from CR was a very good unit as well, I fitted one to a mates car, very responsive, I know another person that fitted one & runs 18psi on track without probs as well.
It boils down to how much you want to wait for spool up, the T25 off Adam (although you are now talking about a T2/25 type turbo I think) will hit full boost around 4k, some people don't like that, I found running 20psi manifold + it didn't matter & @ 21psi it made 207bhp on low comp pistons...(where's the lid for my can o worms)
The other from CR spooled up very fast pulled well, but as it was on a mates car that got sold a month or two later I can't comment on durability..

[jonnyshaw49]

thanks for that mate, adam said its a full t25 but with t2 housing to spool quicker, so is it a t2/t25 because it has a t2 rear housing?? so will it run out of puff at 4k?? when does the cr turbo reach full boost? did you run a different cam on your low comp engine?? what is the max psi on a standard engine? 18 psi??

[Markey Mark (BD)]

thanks for that mate, adam said its a full t25 but with t2 housing to spool quicker, so is it a t2/t25 because it has a t2 rear housing?? so will it run out of puff at 4k?? when does the cr turbo reach full boost? did you run a different cam on your low comp engine?? what is the max psi on a standard engine? 18 psi??

To answer a few of those questions.

Its a T25 with T2 housing so still classed as T25 (sure Adam will correct me if i'm wrong).
No it won't run out of puff at 4k, most prob pull all the way past 6k.
Max boost on a standard engine, are we talking standard turbo, cam, carb, head?

[Adam L]

I let Ricardo use this particular turbo, which was my own, a few years ago. On his 19 conversion, it had a power band up to around 6.5k rpm and was on boost just after 3k. On a stock engine, the T25 turbine wheel matched with the T2 housing makes it very quick to respond and it gets quite lively when you turn the boost up.

It's a full T25.

[jonnyshaw49]

nice 1 that sounds good, i have head work, full stainless exhaust, double intercooler, k and n filter, all the cooling stuff low temp switches and alloy double rad and oil cooler silicone hoses all the bits to keep it cool, also bored out turbo elbow, not sure on what cam is so imagine it was standard, what is max psi i could run???

[Adam L]

As long as you have good oil pressure under load, over 25psi.