Sorry guys another thread on power here


Basically what i would like to know is wether or not to get the engine uprated 1st or wether to get a ppg box fitted.

Ive already got a MD321H turbo.... 740cc injectors....RCM headers and up-pipe.... lightweight pulley set..... uprated clutch.... walbro pump.... link g3 ecu etc etc (all the bolt on stuff) but have not had it fitted yet. Im now getting impatient and want to start putting it together.


Would you advise me to get the box before the engine or vice versa, and why?


Cheers in advance

 

What car do you have?

 

to take full advantage of the mods you are going to need both, you could however still have a very quick car without doing the engine, but you are likely to break the gearbox still.

You don't mention what the current engine is.. if it is a UK engine then if you have the money you would gain by going to sti heads and therefore you could fit the parts to current engine and have it tuned to a reasonable level and build the engine up and then swap.. if however you have sti heads on the current engine it seems somewhat labour consuming to fit the parts tune it up and then pull the engine to strip and uprate...

Is the car daily transport and therefore a broken gearbox a major headache?

It is all down to personal preference really and how you use the car.

Simon

 

Sorry its a uk turbo my99

Standard engine and heads

Its my only mode of transport at the moment

 

the uk 99 heads are not that restrictive.. just rpm limit perhaps low for a 2litre, but excellent on a 2.5.

what are the plans for the internals of the engine? just new rods and pistons etc or are you intending 2.5 or cdb, head work etc..?

if the car is main mode of transport and you cannot easily be without it unplanned then gearbox first, or tuned to lower power to keep it in one piece.

You could fit walbro, headers, and the link g3 and have it tuned on current turbo so as to give you a short term fix which won't break the gearbox.

for reference the MD321H is around 400 at 1.4bar.

Simon

 

Do you still map the g3's ??

 

Yes

 

Im undercided on the engine yet but will probably stick with the 2.0 with rods and pistons sorted.

The pump is already fitted as it was/is running 340bhp from when i bought it

 

How much do you charge for fitting and mapping ? how soon could you do it ?

Ive got my car booked in for a clutch change at the start of next month so anytime after that would be great.

Do you think i should get all the other bits fitted before getting a map or not ??

sorry for all the questions

 

To spead the money you seem to be willing to spend, for a few more pounds you'r be silly not to go for the 2.5 engine conversion.

You'll have a stronger engine, better fuel (barely ) and a good basis for future mods.

But to answer you first question, I'd say go for the gearbox first, and then the engine. Upgrade the engine first and you'll smash the box up. At least if you change the box first you can sell the box on as a working item.

 

Why/how is a 2.5 block stronger than a 2.0 ? Do you mean as in it'll take less boost for more power ? or that the actual block itself is stronger


I have considered a 2.5 but i think im gonna keep the 2.0 im not going to be on a mission for crazy power figures after this build (famous last words) and i do like a revvy engine

 

do you have the adaptalink or just the 20cm loom?

Currently booked up until 16th October.. but as you are localish I could probably squeeze it in somewhere.

The MD321H is a lovely turbo.. as to fitting it there are a number of reason why you should and shouldn't fit it..

what turbo are you running at the moment?

Simon

 

oh and if you intend sticking with the uk heads then the 2.5 would be perfectly matched with rev limit etc.. you wouldn't call it less revvy to the same rpm limit as the 2litre.

Simon

 

Ive got the adaptalink with it

 

Makes installation easier.. nice unit too.

email me if you want to discuss further?

Sales @ JollyGreenMonster.co.uk

Thanks
Simon

 

Cheers simon


Email sent

 

Id get the gearbox changed first. I had my car mapped by simon last week, and the gearbox lasted 2 days, running at around 400ish bhp. Which once mapped, your engine should be making the same.

 

this is very true..

 

Still work in progress then?

 

we ran out of fuelling at actuator pressure (1.3bar).. lol

so it was still in progress

then before we could remap it again after fuelling issue sorted the box went.. although gearbox preservation was not a priority at the time of mapping it has to be said.

Simon

 

Bad news mate.... was that with standard box,standard engine ?? which type car wrx..sti ???

 

wrote a long reply via mobile phone and the phone locked up
I will reply when I get in.

but basically you could

1. fit md321h and we could map it to say 1.2bar and hope the gearbox survives, if it is taking 1.4~1.5bar on td05 16g at the moment then it may last

2. replace gearbox or risk current one and fit md321h and map it to say 1.4bar.. wouldn't want to run more than that on standard internals on that turbo.

3. replace gearbox, rebuild engine and run more than 1.4bar or 1.4bar with a safety margin..

Simon

 

I like the sound of option 1.... I will get the clutch and turbo sorted then contact you after that if thats alright

 

no problem.. if you do the headers, 740s etc at the same time it is then quicker to tweak up the boost later once the box is changed.. it is always a difficult decision.. obviously the box may last or it might not and it is a knife edge between them.

Sorry to speak for Morbs.. but
Morbs engine is about as far from standard as it gets I think

P1 box..

 

Was that on the 740s or was it the pump that gave out? I will be doing much the same soon and have been told 550s will be plenty with a good reg.

 

Thinking of going down the same route, well 380ish BHP is what i'm aiming for (don't know why!!!), but wondering what power can a standard gearbox/clutch handle??? I'm talking My 98 STI's by the way....

And how much is an uprated gearbox???? never even looked into it so no idea's at all..

Cheers

 

PPG do a straight cut gearset for around £2k then its just a case of fitting the cogs to the box. cheapest qoute ive had so far is from lateral performance

 

some boxes last, some don't.. depends on how you drive and how the power is delivered imho..

6 speed box is strong 1500~2000 second hand

uprated gearset around 3000 fitted

 

Its on 740s and a walbro. The main problem was that the fuel pressure gauge was playing up reading the wrong pressure. But Im going to replace the pump aswell just incase.

 

I wouldn't try and push a standard block to 400bhp.

It would cost more in the long run if you waited for the OE block to go before moving onto a built block as you would then lose the resell value of the OE block. Also new block would need remapping again.

I perfer 2.0ltrs too.