Author Topic: Turbo questions...  (Read 91 times)

Offline boosted

  • MRC Full Club Member
  • Major Contributor
  • *****
  • Location: Westbury Wiltshire
  • Posts: 9,665
  • Karma: +25/-1
  • Worryless, Dream more.
    • View Profile
Turbo questions...
« on: March 17, 2020, 09:26:31 AM »
So the mx5 had a chinese t25/28 turbo fitted with external wastegate...
1  why external...better control bigger less chance of over boost?
2. T4 T25 T28 inlet flange the same same?
3. Im trying to spec a decent turbo suited for 250bhp...so fast spool circa 12psi of boost...
For around a grand...gt2680rs Garrett is what im thinking...the borgwarner efr range are 1500 plus...
Stock rods give up at 270bhp...what would be considered safe margin? 250bhp?

Im hopefully getting the damaged turbo as was not with car on pick up...this is how it looked on car...

Sent from my SM-N950F using Tapatalk

92 FD rx7 Twins 13.5psi.  EX Track car
EAT SLEEP ROTOR REPEAT.

Offline Mr Spiller

  • MRC Full Club Member
  • Contributor
  • *****
  • Posts: 211
  • Karma: +3/-0
  • Just joined!
    • View Profile
Re: Turbo questions...
« Reply #1 on: March 26, 2020, 02:36:37 PM »
Jon -  it’s not just BHp with the rods . There’s also a safety net around torque they can take too .
I’ll find out later


Sent from my iPhone using Tapatalk

Offline boosted

  • MRC Full Club Member
  • Major Contributor
  • *****
  • Location: Westbury Wiltshire
  • Posts: 9,665
  • Karma: +25/-1
  • Worryless, Dream more.
    • View Profile
Re: Turbo questions...
« Reply #2 on: March 26, 2020, 04:46:34 PM »
240nm torque or summit...will be mapped at skuzzle or mtech.
Im putting a slightly smaller turbo on...it had gt2860 on putting a gt2560r on...been advised.
Boost from 2100 on a 1.6. And does not run out of puff at top end.

Sent from my SM-N950F using Tapatalk
92 FD rx7 Twins 13.5psi.  EX Track car
EAT SLEEP ROTOR REPEAT.

Offline re japi

  • MRC Overseas Guest
  • Major Contributor
  • ****
  • Location: Hämeenlinna, Finland
  • Posts: 3,608
  • Karma: +20/-0
    • View Profile
Re: Turbo questions...
« Reply #3 on: March 26, 2020, 05:12:26 PM »
Well, I think you have to about gbox and diff too. Yearly Miatas those are quite week...

I reckon that 250 area is in safe zone...

Some dude here are running ++300 and tracks their Miatas. Some of them can take it, some wont. Tracking is more safe than drag is, so...

Anyhoo, i dont know that much about Miatas...

Lähetetty minun G8141 laitteesta Tapatalkilla

Power is nothing without control. Weight is enemy of performance, handling and braking.

http://s1293.photobucket.com/user/japi_laukkanen/library/Japi?sort=3&page=1

Offline Mr Spiller

  • MRC Full Club Member
  • Contributor
  • *****
  • Posts: 211
  • Karma: +3/-0
  • Just joined!
    • View Profile
Turbo questions...
« Reply #4 on: March 26, 2020, 05:46:49 PM »
They had the one from Solent  rotary on local rolling road , he’s pretty good at getting big BHp from them .
Cat had forged rods
Some sort of racing bolts couple of other bits which weren’t overly expensive and they got over 400bhp
That was pushed to the limit


Sent from my iPhone using Tapatalk

Offline boosted

  • MRC Full Club Member
  • Major Contributor
  • *****
  • Location: Westbury Wiltshire
  • Posts: 9,665
  • Karma: +25/-1
  • Worryless, Dream more.
    • View Profile
Re: Turbo questions...
« Reply #5 on: March 26, 2020, 06:22:00 PM »
235bhp max i need.
Ill concentrate on handling and brakes...may have a dabble with this aero witchcraft too.
And a serious case of weight reduction...if it aint needed its going...brackets trim carpets seals hinges its all going...already started...

Sent from my SM-N950F using Tapatalk

92 FD rx7 Twins 13.5psi.  EX Track car
EAT SLEEP ROTOR REPEAT.

Offline Mr Spiller

  • MRC Full Club Member
  • Contributor
  • *****
  • Posts: 211
  • Karma: +3/-0
  • Just joined!
    • View Profile
Re: Turbo questions...
« Reply #6 on: March 26, 2020, 06:48:17 PM »
235bhp max i need.
Ill concentrate on handling and brakes...may have a dabble with this aero witchcraft too.
And a serious case of weight reduction...if it aint needed its going...brackets trim carpets seals hinges its all going...already started...

Sent from my SM-N950F using Tapatalk
200 at wheels on a 900 kg car will be a bit of fun


Sent from my iPhone using Tapatalk

Offline boosted

  • MRC Full Club Member
  • Major Contributor
  • *****
  • Location: Westbury Wiltshire
  • Posts: 9,665
  • Karma: +25/-1
  • Worryless, Dream more.
    • View Profile
Re: Turbo questions...
« Reply #7 on: March 26, 2020, 06:53:17 PM »
Its never gonna be Westory....but  scratch the itch.

Sent from my SM-N950F using Tapatalk

92 FD rx7 Twins 13.5psi.  EX Track car
EAT SLEEP ROTOR REPEAT.