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Thread: Any tips for a little more bhp/torque?

  1. #1
    CC
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    Smile

    Hi!

    First of all I must say how impressed I am with 22b.com. The various sections are laid out particularly well thus making it very easy to navigate.
    Secondly I am also impressed by the quality of information in this Cosworth section and the Cosworth FAQ.

    The reason for my post is that my tuning knowledge is not great nor is my budget. The tuning tips that I've read on here are excellent but are some way out of my reach at the moment.

    My car is a 2WD Sapphire with a 270bhp chip. It has an after market exhaust and filter. Everything else is standard.

    My boost gauge on acceleration reads 21psi upto about 4750rpms then backs off to 14psi, is this normal/safe for a 270bhp chip and a standard T3 turbo/yellow injectors?

    My CO is 3.5 percent.

    I am now used to this power/torque and would like a bit more.

    Would an uprated intercooler make a difference?

    Would light green injectors help the fueling?

    Do I need a 3 bar map sensor?

    Apologies in advance for my naivety on this subject but we all have to start somewhere don't we !

    [This message has been edited by CC (edited 14 August 2000).]

  2. #2
    Senior Member
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    Wink

    CC,

    Glad you are finding this BBS informative, especially the Cosworth section

    Right down to your questions!

    If you are running a 270bhp chip (based on your boost guage readings), I would say that a peak of 21psi is ?. I would expect you to be holding somewhere around 15/16psi. The fact that you are backing off to 14psi, sounds about right, but is too early on in the rev range. This could also indicate a problem. This could be a number of things including a knackered actuator (Is it a -31?/I dont think a standard one can hold 21psi), you could be hitting the boost limit or the charge temp is too much on your cooling system - amongst others.

    I hope you mean your CO is 3.5% on idle........If it's that on run, you better get it checked out NOW!!!

    From what I know, an uprated intercooler on your model will help tremendously (apparently an inherent problem on sierras - Except the RS500 ).

    Uprating the injectors are only required if you are looking at changing the ECU program. For your present chip, they are not required.

    Same goes for the 3 bar map sensor, not needed until you go to future levels.

    If I was you I would take you car to a reputable cosworth rolling roader. Get him to check your boost and fueling, just to be on the safe side. If your boost figures are right, they need adjusting immediatley!!!!

    For the next level you need the following:-

    4 x Green injectors - 803's
    3 bar map sensor
    -31 actuator
    Stainless exhaust from turbo back
    new chip

    This conversion would give you upto 330bhp and bags more torque. I personally would not go any higher, then this with your engine. As unfortunatley your block is made of chocolate!!!! (Needs a 4x4 one!!!!)

    Shaun.

    Anymore for anymore (waiting for John or Mike to correct me!!!!!)


    [This message has been edited by shaunee (edited 15 August 2000).]

  3. #3
    Stef
    Guest

    Post

    According to the RSOC....no, I won't bother.

    Stef.

  4. #4
    CC
    Guest

    Post


    Shaun, my mistake, the car does boost to 21psi (do you think this is too high for a 270bhp chip?) but it backs off later, at about 5500rpms...is this backing off in boost normal for chipped car in your opinion? LOL, yes the 3.5 CO is at idle, thank god!

    Thats one of the main reasons i posted cos I'm considering a new intercooler and wondered what effects it would have without changing anything else on the car.
    I do have a -31 actuator.

    Why a stainless exhaust from turbo manifold? The exhaust i have on it now is a 'mild' stainless 3" pipe all the way through. But i've seen Cossies with bigger downpipes?

    Yes I will get it rolling roaded soon and set up properly, but before i do that I'd like to put any simple mods on it beforehand so that it can be set up as a whole - if u get my my meaning!

    What intercooler would best suit my set-up/budget?

    Yes I've read the 2WD doesn't have the best bottom
    end, unless you're talking about the 2WD RS500!

    Thanks for your help.

    PS Stef come on spit it out!

  5. #5
    Mike Rainbird
    Guest

    Exclamation

    CC,
    Turn the boost down quick, or suffer the consequences! The injectors cannot cope with that kind of boost and the engine will be running lean, which may cause a major melt-down or at the very least the det will be slowly eating away at the head / tops of the pistons!

    You obviously either have an aftermarket actuator or the settings on the amal valve are way out! What you should be aiming for is a spike of 17-18 holding a constant 14-15psi. Any more than this is may cause damage.

    An uprated intercooler would cool the charge air and is worth another 10-15bhp if you are using the standard 2wd item. A good cheap upgrade is to use the 4x4 one which is much larger. The problem with this is that due to its increased efficeciency, the boost will rise even more by 2-3 psi and will need to be turned down to compensate.

    Light green injectors are only a few more percent up on the standard ones, but would definitely help if you are insistant on leaving the boost settings as they are....

    You do not need a 3 bar MAP sensor unless you are running more than 15psi constant held boost. This is required when you switch to dark green injectors, as you would then be running 21psi of boost with the standard turbo to get 300ish bhp.

    The 2wd block is more than adequate for up to 350bhp, and after that only needs replacing when it cracks (which it will do when running big boost ).

    I also hope you are running super-unleaded fuel. If not, you are probably too late in preventing any damage anyway.....
    Mike R
    Norfolk Group RSOC Chairman www.rsnorfolk.co.uk

  6. #6
    CC
    Guest

    Post

    Thanks for the advice

    I changed to SUL when leaded was no longer available and have used it since.

    I've heard of 'octane boosters', does have anyone have any opinions on the function/necessity of these?

    I thought 21psi was a bit much. I vaguely remember, not longer after I'd bought the car, a supposed 'Cosworth specialist' messed around with the amal valve in order to give more boost, and I've thought nothing of it since....maybe this is the reason for the high boost?

    How I am best decreasing the spike, by adjusting the actuator myself or shall I best leave it to a tuner (obviously not the same one!)?

    I understand the gains involved in an uprated intercooler ie as in decreasing the charge temp. But as u say, this will increase the psi, so again I will be running too much boost for yellow injectors, so I'll have to reduce the boost, losing the possible 10-15bhp gains in the process...isn't this catch 22!?

    Again sorry if i'm way off the mark here as I'm only just becoming interested in tuning etc.

    Thanks...

  7. #7
    Senior Member
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    Post

    See, Mike & I nearly agreed!!!!

    IMHO, if a car is set-up right, by a reputable tuner, you shouldnt need to run on Octane Boosters. The only time I would consider in using this (I am assuming any car I run is set-up correctly), is down Santa Pod or on a Track day. If the chip and set-up is correct, there is no reason to use it!!!

    Adjusting your own boost.....

    Are you competant?
    Do U know what you are doing?
    Are you sure your boost gauge is accurate?

    If you cant answer positively to ALL of the above, leave it to a professional!!!

    If you want to email me, i'm sure between me Mike & John, we can suggest RELIABLE tuners near to your location.

    Mike's on about HP gains on your proper boost settings! So it's very relative. From my limited past experience, better cooling doesnt give you more power over your conversion target (well not in the case of uprating to a different intercooler), e.g. 270bhp (Mike's bound to shoot me down in flames!!! ). It will just give you a better chance of achieving this target. IMHO rarely do stated conversion BHP's get reached! There's alot of BULLSH!T out there!

    Shaun.

    P.S. Not that this is very conclusive, but what colour is the inside of your tailpipe. If it's not black.........you better get your wallet out
    [This message has been edited by shaunee (edited 17 August 2000).]

    [This message has been edited by shaunee (edited 17 August 2000).]

  8. #8
    Mike Rainbird
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    Post

    CC,
    I would personally steer clear of octane boosters and instead have the car set up safely to run on the current 97 RON fuel. This is because I have heard of octane boosters increasing the heat inside the engine and causing more problems than they solve.

    If you reduced the "spike" boost on the actuator, you would also reduce the held boost as well. As 14psi is spot on for the held boost, you only need to reduce the spike and would have to do this by re-jetting the amal valve.

    The gains from the intercooler are purely down to the more dense charge air that the bigger intercooler could provide. As an engine is just basically an air handling unit - i.e. the more air you get in (and providing it is matched by a corresponding amount of fuel), then the more power you get out of it. Accordingly, a larger intercooler can provide a more dense charge air at any given boost pressure, over your standard one.

    For your information I have a second hand Pace RS500 item for sale for 150 (as I needed one with a bigger inlet as I have just put a T4 on mine)....
    Best regards
    Mike R

  9. #9
    CC
    Guest

    Post

    Mike I've heard/read bad things about the effectiveness of pace items (to do with the core i think)....no if u had a 4x4 for less than a oner...lol!

    Shaun the answer is no, no, and no! so I think a trip to a decent tuner in the North West is on the cards, any suggestions?

    My exhaust isn't black...

    Thx again.


  10. #10
    Senior Member
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    Red face

    CC,

    If it's white/grey/light brownish, it's running MEGA lean.......if that's the case, get it sorted ASAP!!!!!!!!

    Shaun.

  11. #11
    CC
    Guest

    Post

    Sorry shaun, i meant that the exhaust tailpipe is black...it is 3.5 CO at idle which is ok i think but I'm actively looking to get it rolling roaded b4 the end of the month.

    With regards to the Pace intercooler, before i upset anyone, i'm not saying there is anything wrong with them as i've never owned one, they maybe fantastic for all i know and the little snippet i'm quoting could well be wrong...

  12. #12
    Mike Rainbird
    Guest

    Post

    CC,
    I also have a 4x4 intercooler sitting in the loft - yours for 100....
    Best regards
    Mike R
    PS I have a Pace RS500 intercooler on mine and have no complaints.....
    PPS If you are interested, I won't be able to respond, as I go on holiday tonight for two weeks.....

    [This message has been edited by Mike Rainbird (edited 20 August 2000).]

  13. #13
    CC
    Guest

    Post



    [This message has been edited by CC (edited 23 August 2000).]

  14. #14
    Mike Rainbird
    Guest

    Question

    CC,
    I take it you are not interested?
    Best regards
    Mike

  15. #15
    CC
    Guest

    Post

    sorry mike i bought one when you were looking at the pyramids....couldn't wait as i wanted it for a track day on the 30th Aug which was cancelled anyway...........pain to fit too, had to shave off the top of my rad, if i need owt else i know your the man to ask.

  16. #16
    Mike Rainbird
    Guest

    Red face

    CC,
    No worries, sold it an hour later anyway!

    Can't believe you shaved the radiator! It only needs a couple of spacers to drop it down and Bob's your mother's brother...

    Live and learn...
    LOL
    Mike R

  17. #17
    22B Moderator
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    Today i shall mostly be twidling with my knobs
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    Talking

    hehehehe

    sorry, shouldn't laugh

    If in doubt, ask

    The gurues are here LOL

  18. #18
    CC
    Guest

    Unhappy

    DOH!!!....silly me , my knuckles looked like I'd been punching bricks lol! God knows how an RS500 jobbie would fit in there!

    Differences? It seems to hold boost a little longer I think.

    All part of the experience I suppose but next time I will ask!


  19. #19
    Senior Member
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    Wink

    CC,

    What, all 21 psi of it .......on a stage 1 chip

    Shaun.

    [This message has been edited by shaunee (edited 07 September 2000).]

  20. #20
    dumped
    Guest

    Post

    So chris you want bhp and torque - Simply fit a button.

    Click..........................and your gone!

    Gone in 60secs - more like 2secs and one gear change!

    Martin



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