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Hot!Time to repair my Late 92 Hard Top

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92 Hard Top
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Re: Time to repair my Late 92 Hard Top 2019/02/07 11:17:23 (permalink)
0
Upgrading
Garrett GT2860RS Ball Bearing Turbo A/R 0.64 (Disco Potato)
To
Garrett GTX2860R Gen II Turbo T25 / 5 Bolt 0.64 A/R
Went with this over Garrett 307s. Because I want boost to come as early as possible.
 Features:
  • Increased Horsepower Range
  • Fully Machined Speed Sensor Port
  • Improved Surge Resistant Ported Shroud Design
  • Lightweight Billet Back Plate
  • New Compressor Housing Aesthetics

Specifications:
  • Approximate Horsepower Range for Engine Capacity: 200 - 475Hp (1.4 - 2.5L)
  • Compressor Wheel Inducer Size (mm): 46
  • Compressor Wheel Exducer Size (mm): 60
  • Compressor Wheel Trim (mm): 76
  • Turbine Wheel Inducer Size (mm): 57
  • Turbine Wheel Exducer Size (mm): 47
  • Turbine Wheel Trim: 76
  • Wastegate: Internal Wastegate
post edited by 92 Hard Top - 2019/04/16 11:29:25
#46
TonyMR2
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Re: Time to repair my Late 92 Hard Top 2019/02/07 15:30:01 (permalink)
0
I am sure you have done your flow calculations (charts online) / plotting flow, as well as chatting with other owners who has a similar build components.

Help me to understand your build decisions, oversized valves aka increase lag yet increase flow for high rpm, upgrade camshafts to help flow, tiny turbo on a tiny a/r would this not restrict hp in the mid to high rpm.

If you haven’t purchased yet, why not go the newer g25-550...

Interested to understand what rpm you expect to see what boost and power band hp (rpm to rpm average hp).
#47
92 Hard Top
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Re: Time to repair my Late 92 Hard Top 2019/02/08 12:06:17 (permalink)
0
TonyMR2
I am sure you have done your flow calculations (charts online) / plotting flow, as well as chatting with other owners who has a similar build components.

Help me to understand your build decisions, oversized valves aka increase lag yet increase flow for high rpm, upgrade camshafts to help flow, tiny turbo on a tiny a/r would this not restrict hp in the mid to high rpm.

If you haven’t purchased yet, why not go the newer g25-550...

Interested to understand what rpm you expect to see what boost and power band hp (rpm to rpm average hp).

TonyMR2
I am sure you have done your flow calculations (charts online) / plotting flow, as well as chatting with other owners who has a similar build components.

Help me to understand your build decisions, oversized valves aka increase lag yet increase flow for high rpm, upgrade camshafts to help flow, tiny turbo on a tiny a/r would this not restrict hp in the mid to high rpm.

If you haven’t purchased yet, why not go the newer g25-550...

Interested to understand what rpm you expect to see what boost and power band hp (rpm to rpm average hp).

G25-550 is $3300 to buy it's rated up to 550hp this is an overkill for my build.
The Garrett GTX2860R Gen II Turbo 10 to 15% more efficient than the Garrett GT2860RS Ball Bearing Turbo A/R 0.64 (Disco Potato). So 350hp to 475hp increase on spec sheets. I can reuse my exhaust housing with the new turbo and keep all my pluming the same, that save me some coin. 1mm bigger valves is not going to created lag. Going to a T3 flange will. T25 flange will work better lower and mid range revs, Remember I'm will tune this car with 800cc injectors so this turbo choice will work fine. The 265 cams is a balance power and torque. The Links ECU will control the wastegate greep and bring the boost on as fast as it can to 12psi and upwards as revs increase.This boost will happen between 2000 - 2500 rpm. I will not need to run as high boost levels to achieve a balance hp curve. I have had a 348rwkw, 550-600hp Mr2 before it was great for draging etc, not so good for track days as, lag etc. Hope this give some insight.
#48

TonyMR2
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Re: Time to repair my Late 92 Hard Top 2019/02/08 16:48:27 (permalink)
0
Like it :) responsive build for fast dashes out of corners with such a small turbo (positive thing)
I was following the hype of the g25 said to be responsive like the gtx28, however have not plotted the turbo.
post edited by TonyMR2 - 2019/02/08 17:00:38
#49
5SGTE
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Re: Time to repair my Late 92 Hard Top 2019/02/10 17:09:02 (permalink)
0
I can tell you first hand a gtx2867 0.86 housing, 264 cams, 5s bottom end on e85 is a spool monster. Midrange is exceptional.

Yours will be a fun drive by the sounds of it.
#50
92 Hard Top
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Re: Time to repair my Late 92 Hard Top 2019/02/12 15:27:24 (permalink)
0
Looking like a art piece!
#51
92 Hard Top
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Re: Time to repair my Late 92 Hard Top 2019/03/09 22:20:04 (permalink)
0
Took out fuel tank. New Walbro high flow fuel pump installed. Good for 500hp plus. I would hate to pull this out with a motor in the car.

Sent from my SM-G930F using Tapatalk

#52
Falcon
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Re: Time to repair my Late 92 Hard Top 2019/03/12 07:57:40 (permalink)
0
Looks the goods. Black block and Moroso sump really nice but that alternator bracket? Geees. I dunno about that. Shiny things inside too.
#53
92 Hard Top
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Re: Time to repair my Late 92 Hard Top 2019/03/12 11:49:51 (permalink)
0
Falcon
Looks the goods. Black block and Moroso sump really nice but that alternator bracket? Geees. I dunno about that. Shiny things inside too.


It will match the rocker cover. Black can get a bit boring.
#54
92 Hard Top
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Re: My repaired Late model 11/92 with Gen 3 body Hard Top 2019/03/12 12:21:28 (permalink)
0
Home made inter cooler water spay system. $ 20 to make it. It will be controlled by the links ECU it only comes on when intake air temps are to high and with high boost levels. I used a hyundai window washer pump installed in the boot. Hose runs along boot release cable not through the engine bay. Now I can keep my AC. Got small youtube VID showing test run.
https://youtu.be/LTnnctXtxXo

 
#55
TonyMR2
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Re: My repaired Late model 11/92 with Gen 3 body Hard Top 2019/03/12 13:56:36 (permalink)
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Love the cooling mod :) simple and effective!

The walbro, looks like a walbro 255 model?
Fuel pump calculations are a little more complex than the box - 500hp, as boost hurts flow badly. The walbro 460 runs out of fuel flow below 3sgte makes 500rwhp, with two options of dual pumps or the new walbro hellcat. However you are not aiming for 500hp from memory.
post edited by TonyMR2 - 2019/03/12 15:32:04
#56
92 Hard Top
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Re: My repaired Late model 11/92 with Gen 3 body Hard Top 2019/03/12 14:07:20 (permalink)
0
TonyMR2
Love the cooling mod :) simple and effective!

The walbro, looks like a walbro 260 model?
Fuel pump calculations are a little more complex than the box - 500hp, as boost hurts flow badly. The walbro 460 runs out of fuel flow below 3sgte makes 500rwhp, with two options of dual pumps or the new walbro hellcat. However you are not aiming for 500hp from memory.

http://walbrofuelpumps.co...-intank-fuel-pump.html
#57
robk
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Re: My repaired Late model 11/92 with Gen 3 body Hard Top 2019/03/12 21:13:55 (permalink)
0
Rodney, that Walbro 255 fuel pump will absolutely not flow enough fuel for 500hp on E85. The rating on the website is for gasoline.
Maybe you're not planning to run E85, but I assume you are.

There is an extensive build thread for my car here: http://www.mr2australia.com/mr2play/tm.aspx?m=18316
#58
TonyMR2
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Re: My repaired Late model 11/92 with Gen 3 body Hard Top 2019/03/12 21:34:19 (permalink)
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I found the online fuel calculators such as Raceworks and Injector Dyamics, along with the walbro fuel pump flow charts with pressure drop, very helpful to calculate maximum possible fuel pump flow (at applied pressure).

Claimed pump rating at 500hp rating is basically zero fuel pressure, 8an line matching outlet minimal length, no fuel filter, and no boost pressure... that’s not real world 3sgte....

Use the calculators for you own application :)
#59
92 Hard Top
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Re: My repaired Late model 11/92 with Gen 3 body Hard Top 2019/03/13 13:34:46 (permalink)
0
robk
Rodney, that Walbro 255 fuel pump will absolutely not flow enough fuel for 500hp on E85. The rating on the website is for gasoline.
Maybe you're not planning to run E85, but I assume you are.

Not doing E85.


#60
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