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Justin Green
Tinkerer
sa
SC400/Soarer V8

Posts: 38
Reg: 01-2009

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Thursday, January 15, 2009 - 01:11 am, by:  Justin Green (Jaay_dogg) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hey guys, I have a V8 Soarer, It could be my imagination, But it seems sometimes I hit the throttle, My car "Feels" quicker than other times, like it goes harder one time than another, I know this sounds weird, but it could all be in my mind, but out of curiousity has anyone else had the same experience?
Steve Zac
Tinkerer
vic
v8

Posts: 78
Reg: 09-2008

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Thursday, January 15, 2009 - 01:38 am, by:  Steve Zac (Tnt992) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Mate I have the same issue. I changes shift solenoids because it started in 2nd gear sometimes. I still have the same feeling even though it starts in 1st gear each time.
I help out at my mechanics and he drove the car an said the throttle body on the car is larger for better response up the rev range as opposed to a smaller throttle body for better takeoff. Don't know how true this is but if I take off with 3/4 throttle the car takes off faster than full throttle.

Luxury cars aren't designed for hard take off but have power while in regular drive speed like bmw which don't take off fast but once your going have more ba*ls than your every day commodore or camry.
Mike Beck
Goo Roo
New Zealand
Soarer Limited UZZ31 V8

Posts: 3200
Reg: 11-2005

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Thursday, January 15, 2009 - 03:50 am, by:  Mike Beck (Gold_40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yep, can take off in 2nd some of the time.

I will be putting a manual into mine eventually, no more dullness!
Joe Russell
TryHard
Marlborough
4.0 V8 GT-L

Posts: 127
Reg: 10-2008

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Thursday, January 15, 2009 - 04:30 am, by:  Joe Russell (Joe_r) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yup its the same with me. The whole full throttle 3/4 throttle is annoying as hell though.
Vinny Ozorio
Tinkerer
NT
Z30 Soarer V8

Posts: 79
Reg: 05-2007

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Thursday, January 15, 2009 - 08:28 am, by:  Vinny Ozorio (Fruitloop) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Is this a side effect of having a BFI ??
Steve Zac
Tinkerer
vic
v8

Posts: 80
Reg: 09-2008

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Thursday, January 15, 2009 - 09:13 am, by:  Steve Zac (Tnt992) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Does everyone with weak takeoff have BFI?
I bought my car with a cutout air box. Never driven it as it was original so maybe I will try getting a new air box and see how I go. Anyone got one I can just use for testing?
Mike Beck
Goo Roo
New Zealand
Soarer Limited UZZ31 V8

Posts: 3206
Reg: 11-2005

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Thursday, January 15, 2009 - 09:33 am, by:  Mike Beck (Gold_40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

More than anything, I believe this feel of it being slower, is you just getting used to it.

Go drive gutless 1.6 for a day or two, then hop back in the soarer and it will feel grunty down low again!
Alex Barbieri
TryHard
VIC
V8 GT-L

Posts: 321
Reg: 08-2007

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Thursday, January 15, 2009 - 09:33 am, by:  Alex Barbieri (Barbieros) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Mine has done this before and after BFI, but it has solenoid issues too.
Joe Russell
TryHard
Marlborough
4.0 V8 GT-L

Posts: 130
Reg: 10-2008

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Thursday, January 15, 2009 - 09:47 am, by:  Joe Russell (Joe_r) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I think its more to do with old ecu's and as Alex said gearbox solenoids.
BFI is unlikely to affect it take off adversely.
David Vaughan
Goo Roo
ACT
V8 Ltd manual

Posts: 4124
Reg: 07-2005

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Thursday, January 15, 2009 - 09:53 am, by:  David Vaughan (Davidv) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


quote:

BFI is unlikely to affect it take off adversely


so much so that it is a ridiculous notion :-)

Aside from take-off, ECU retraining will affect responsiveness from time to time. It always reflects the progression of use in your last 30-40 starts.
Mike Bradberry
Goo Roo
Queensland
V8 UnLimited

Posts: 1143
Reg: 07-2005

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Thursday, January 15, 2009 - 11:41 am, by:  Mike Bradberry (Halflife) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

So there's your answer. 30-40 burnouts and your takeoff will be as good as you are going to get.
Steve Zac
Tinkerer
vic
v8

Posts: 82
Reg: 09-2008

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Thursday, January 15, 2009 - 12:17 pm, by:  Steve Zac (Tnt992) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Then you will need a diff and a new transmission but at least your motor will pull hard lol..... You gota love big fat lazy luxury cars.
Joe Russell
TryHard
Marlborough
4.0 V8 GT-L

Posts: 131
Reg: 10-2008

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Thursday, January 15, 2009 - 02:35 pm, by:  Joe Russell (Joe_r) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Haha yup! Glad drag masters is coming up
Jamie Metropoulos
TryHard
wa
lexus v8 LEXPLAY

Posts: 174
Reg: 10-2005

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Friday, January 16, 2009 - 11:50 am, by:  Jamie Metropoulos (Lexdoit) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

i know we shouldn't give our cars when they are cold BUT i recon mine has more power when its cold. is this maybe because the coolant temp sendor is telling the computer to give more fuel because its cold???
Joe Russell
TryHard
Marlborough
4.0 V8 GT-L

Posts: 135
Reg: 10-2008

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Friday, January 16, 2009 - 02:37 pm, by:  Joe Russell (Joe_r) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Well the running mix is rather rich anyway, so I doubt it. Most likely air intake temp I reckon Jamie.
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 10379
Reg: 11-2004

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Friday, January 16, 2009 - 03:31 pm, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

When cold, timing is also advanced, hence more power. There was a thread about fitting a resistor to the ECU temp sensor to fool it.

I did this mod (with a switch) and it worked well for me. I since removed it as part of tidying up the wiring.
Joe Russell
TryHard
Marlborough
4.0 V8 GT-L

Posts: 137
Reg: 10-2008

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Friday, January 16, 2009 - 09:12 pm, by:  Joe Russell (Joe_r) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

What kind of difference to performance did it make Peter? Is it like running 100 octane?
Ben Kelly
DieHard
Wentworthville
v8

Posts: 514
Reg: 08-2005

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Friday, January 16, 2009 - 09:19 pm, by:  Ben Kelly (Ace) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

yeah i notice this as well, its much more responsive in the morning. if anyone has a simple switch mod id like to see it.
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 10381
Reg: 11-2004

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Saturday, January 17, 2009 - 12:50 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hard to quantify, but eg at 40kph on a damp road, slamming the throttle to the floor, it would jump back to first and with the resistor switched in the wheels would spin, but not with it out.

This was repeatable whenever I liked (and had a damp road).
Sean Routledge
TryHard
Victoria
V8 Limited

Posts: 442
Reg: 07-2008

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Saturday, January 17, 2009 - 11:23 am, by:  Sean Routledge (Stircrazy) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Have you boxed your BFI in properly?

My V8 is quicker in the morning because the engine's cold and it's sucking in cold air. As the car heats up, the engine gets hot and then it's sucking in hot air (mixed with cold), hence the lack in power.

That's my assumption anyway, i'm gonna get a top plate and see if anything changes.
Joe Russell
TryHard
Marlborough
4.0 V8 GT-L

Posts: 139
Reg: 10-2008

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Saturday, January 17, 2009 - 12:07 pm, by:  Joe Russell (Joe_r) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I have mine boxed in quite well, its not exactly insulated though.
Alex Barbieri
TryHard
VIC
V8 GT-L

Posts: 358
Reg: 08-2007

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Thursday, February 05, 2009 - 05:30 pm, by:  Alex Barbieri (Barbieros) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Just another thought, and correct me if i'm wrong, if your having fuel pump issues you will have better performance with a full tank.

I've just gone through my 2nd pump (after replacing the first one with a 2nd hand unit) so a Bosch 040 is on the menu.

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