Hey guys, looking to +t my 740 sedan and I need a manifold (can sort out piping etc but would consider buying factory parts).
Some advice would also be much appreciated. I’m planning on 10psi with upgraded fuel pumps and injectors. It’s got lh2.4 and I’ve heard that it will cope with that amount of boost on the na ecu. I’m just looking for about 140hp out of it. If I’m missing something etc I’d love to hear about it and thanks for the help in advance.
No you cannot have 10 psi of boost safely using the non turbo ECU
Even the factory fitted turbo ECU is needed with only 4 psi as it is in the low boost 940 (7psi high boost version)
Since your standard 740 has around 114hp at the engine, you might be better off and having less difficulty if you choose to stay NA. You would be around 140hp with only changing some basic bolt on parts
What bolt ons would be available for na use? I definitely want a turbo but I’d still consider keeping it na.
Before doing any engine mods it's a good idea to do a stage 0 tune up (ignition, any gaskets or seals that need changing and any other wear items that can affect your engines performance)
For starters the standard exhaust is restrictive. A 2.5" system with a high flow cat converter and straight mufflers will gain you 10-20hp
Then to get the most from the upgraded exhaust, a camshaft change will give you an additional 10-20hp
Try that, see how you like it then if you still need more, it will be time to remove the cylinder head to send it away for porting, larger valves and new valve seats but that gets expensive
I’ve already done all of the gaskets etc and it’s a pretty solid engine from what I’ve seen. I can’t seem to find a slotted cam too easily and it would be a bit lazy with the auto I have in it. I also dont want to open up the engine too much which was why I was thinking a turbo.
I was also planning to do the exhaust after mapping out where I could put it with the turbo and manifold on.
It all depends how much you want out of it how far you want to take it and how much you can spend
With adding a turbo the engine has to be removed to drill into the block for the turbo oil return
Big labour intensive job and for the power level you want I wouldn't bother
Worth it if you convert to manual though
In other posts on here (Black Dynamites for example) a dollar figure for basic turbo addition and all bits needed to have it sorted,running and reliable is thousands of moolah.
You just can't do it cheap or it will fail constantly and you end up paying more in the end than if done properly.
Look up threads on +T on here.
I’m not too fussed about how much it will cost and I am looking at a manual down the line. I just want to have a bit more fun with my little tractor motor and want a bit of a project. I’ll definitely be winding the boost up later on which is why I do want to go turbo and not just some easy performance mods for na
Turbo conversion definitely wakes them up aloooot but you would be surprised how fast your money goes its all the little shit that adds up fast .
if you're going down the turbo path try and get a good game plan going of where you want to end up so you don't have to constantly upgrade things (like i did)
i started out just wanting a stock turbo setup in my 240 , nothing crazy just the stock system a 740 came with .
i bought a 740T donor car and got to work, got it all in and running and it was great . 2 weeks later i bought a bigger turbo, bigger intercooler , bigger injectors then some tuning chips , played around with that for awhile then upgrade time again another turbo, even bigger injectors , big maf and aggressive chips now it hauls arse and i still want more .
if you're anything like me and are going to want more and more then sit down and work out an end goal you want to be at, its simple just going stock now but every time you upgrade you're spending more and more money when you couldve just done it right from the start.
if you want to get past the 300ish hp mark then start with aftermarket management before you do anything , LH2.4 is good but leaves alot on the table .
if i was to do it all again ( which lets be honest i probably will at some point haha ) i would go aftermarket management straight up , even at stock turbo power a good tune would go so far.
also worth noting if you're staying with the NA motor and going +T you will be limited how much boost you pump thru the old girl
another side note if you plan on going turbo and manual dont even think about using an m46 or m47 at anything more then stock power( even then you will probably blow it up ) you will want to go T5 or something along those lines
oh completely forgot to address your actual wanted add haha ,
im upgrading yet again soon and will be going to a top mount turbo manifold so ill have my 90+ manifold available its been ported already .. i dont have a time frame it will be done but if you're still looking when i do it i can let you know .
Dave please i wan that 90 + manifold. Ill even give you the clutch fork you want.
I’m still interested in that manifold for sure but I could probably go for another one if need be.
I'm still ways off changing my setup, I've almost finished my current project then I guess I'll get bored again and go top mount haha
