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Old 20-10-2007, 04:56 PM   #1
FEM
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Few questions & senarios for the BPT owners

Hey guys

few questions..

- bpt with b6t rods and stock pistons

1. What boost will it be able to handle?

2. If you were to get a big turbo that would spool up late but come on very strong, would this put more pressure on the pistons and rods? < i am assuming so but i want to make sure!

3. Would a turbo that comes on more gradually but very strong right through the range be easier on the internals?

4. I have heard from others that small turbos wreck engines? Is this correct?

5. b6t rods and stock pistons with a VF8 hybrid be the go? I dont want ball breaking power but i want more than the VJ20 can provide. I have found that the vj20 looses its nuts VERY quickly.. then i hit boost cut :'(

6. Going to something way different - like a T28BB or something like that be a silly option because the turbo and engine are not matched?

sorry about the questions.. i had to post.. they were bugging me hehehe

thanks

dan
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Old 21-10-2007, 05:20 AM   #2
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1. 12-14psi - still only stock pistons, do not bother with rods until you have done pistons. the pistons are weaker than the rods.
2. Yes - more boost = more pressure + s@#tty drive.
3. Nope - if same boost then same pressure.
4. Lies - how?
5. Nope - up the boost cut for find the issues with your motor/engine/car.
6. Errr - now power until 4500-5500 rpm then max at 6500rpm, how boring...

Side note:- have you had your engine/motor/car checked for possible faults or issues as to why this may happen? had someone with experience drive or be passenger in your car?
your current wheel and suspenion setup is bad. i'd apply some money there 1st before looking at engine power. !!!power is no good if it won't get to the ground!!! 14" wheels + old tyres + sloppy king springs just won't cut it.

Ryan

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Old 21-10-2007, 10:24 AM   #3
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I'm buying new 16" rims on tuesday and getting new wheel bearings too.

Spoke to Greggles yesterday about suspension. A possible Bilstien race spring put over the KYB with a Coilover kit. That, or get some Eibach springs, i hear you can get them for the Astina's.

Ryan:

5. Nope - up the boost cut for find the issues with your motor/engine/car

^^ What do you mean by that?

Side note:- have you had your engine/motor/car checked for possible faults or issues as to why this may happen? had someone with experience drive or be passenger in your car

^^ And that?

Thanks

Dan
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Old 21-10-2007, 10:44 AM   #4
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Quote:
Originally Posted by tinastar View Post
5. Nope - up the boost cut for find the issues with your motor/engine/car
for = or ... typo sorry dan.
Quote:
Originally Posted by tinastar View Post
Side note:- have you had your engine/motor/car checked for possible faults or issues as to why this may happen? had someone with experience drive or be passenger in your car.
well you seem to be complaining a bit about your current power/setup. i've been in many bpt cars and haven't seem to had an issue with power/boost cut/etc.

i'm not saying there is anything wrong with your current setup. but if there is and you drive it everyday, then you may not notice if it has one. a fresh set of eyes and ears might just help.

ryan
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Old 21-10-2007, 11:18 AM   #5
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Ah k, yeah i understand.

Well, because i was getting terrible kilometers around town in my car ($60 - 150kms) the actuator was taken off so i wasnt on boost so quickly. The actuator was jammed at 30% open.. hence the reason why i had HUGE boost issues.

Anyway, now that the actuator has been taken off, i am not on boost as much, which bumped my kilometers up to around 400km round town and 650km on the freeway.

Having two 'exits' for the gas to escape from, insted of one upto a certain PSI, i think the VJ dies alot earlier... It is like having the natural power ban of the bp engine magnified.. before 4100rpm the turbo is struggling and after 5500rpm its all over.. nothing happens

My boost cut is set to 12psi and i seem to just touch on it at around 6200rpm+. The reason i have such a low cut is because my side mounted intercooler does nothing what so ever..

I have a nice PWR core sitting here waiting to go on but it will almost need a retune when i put it on. I rather get another turbo (hybrid or a new setup) and get the engine rebuilt and so on and THEN go for a retune.

I went in Lynx's car and its alot stronger than mine when it picks up and goes because of the actuator. My turbo still arrives with a nice knock but its seems too run outta legs very shortly after.

Hmmmmm....

Dan
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Old 21-10-2007, 11:51 AM   #6
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Well i'd be looking at your turbo, sounds like it has issues to me. (like me lol)
put the FMIC in asap, might help the cause. wont need a tune with it installed right away.

ryan
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Old 21-10-2007, 01:15 PM   #7
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A mate told me that itll run rich and stall and so on???
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Old 21-10-2007, 04:58 PM   #8
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You have no AFM right. So you are runing a programmed map in your ecu. Can't see it changing it's fuel loads when they are set.

Go ask a mechanic, not your friend.

If anything if might run lean up high revs do to more denser/cooler air getting into engine. 5mins with a hand controller will fix that problem though.

Ryan
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Old 21-10-2007, 06:07 PM   #9
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Ahhh yeah.

Yeah i dont have AFM.

Ok, i will be calling pits on the GC tomorrow

What about the turbo?

Dan
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