SBR 2.5L Put to the test! Slowboy Rally engine takes to the streets!
723whp
587 tq all done at at or under 30psi
thats what im saying
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From: Sanford, FL!!!
I would like to hope so, but I feel you may be a bit high on your estimates. Remember, this is a pump gas/meth injection car. I think 30psi might be a stretch.
Oliver
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From: Sanford, FL!!!
Dyno Graphs!
The moment you have all been waiting for
Stock Turbo @ 15psi
50 Trim @ 17psi
Oliver
om@slowboyracing.com
I would like to hope so, but I feel you may be a bit high on your estimates. Remember, this is a pump gas/meth injection car. I think 30psi might be a stretch.
Oliver
om@slowboyracing.com
Oliver
om@slowboyracing.com
go big or go home!
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From: Sanford, FL!!!
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From: Sanford, FL!!!
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From: Sanford, FL!!!
While your enthusiasm is refreshing, I assure you the diffence form this 2.5l versus a 2.4l does not justify the cost of a Billett crank. If you really wanted a low end monster and were paying for a billett crank, just get a larger stroke. Even the 100mm crank limites redline a decent amount.
I can tell you from experience - the 2.5l (102 mm stroke) makes about 5-7% more TQ to the wheels than a 2.4l (100 mm stroke).
If you have a beer budget - you cannot afford to drink wine - a nice billet crankshaft is like a glass of 2004 Miner Family Cabernet Sauvignon from the great wine making state of Ca.
Some people do not mind paying $1,200.00 - $2,500.00 for a billet crankshaft to make 5-7% more TQ - .
Mike Huml
Slowboy -
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From: Sanford, FL!!!
My post -
Your reply -
You basically repeated what I said - however:
I never mentioned "lower revs" or "same stroke".
And we agree - the difference is the RR - so yes the 2.5l with the same length rod is at a disadvantage to a 2.0l, the same H beams in a 2.0l in theory will indeed hold more HP.
Are we on the same page or did I miss something?
Mike Huml
Slowboy -
Originally Posted by SBR INC 
The guys have specific instructions.... I want to know EXACTLY what they will hold in this set up!
Yes, in case you do not know my sick mind, we will be blowing this motor up some time in the near future for the sake of science... Remember - with the RR (rod ratio) being a bit different - a 2.0l IMO the Eagles will hold up to more abuse... this will be a great test however!
Mike Huml
Slowboy -
The guys have specific instructions.... I want to know EXACTLY what they will hold in this set up!
Yes, in case you do not know my sick mind, we will be blowing this motor up some time in the near future for the sake of science... Remember - with the RR (rod ratio) being a bit different - a 2.0l IMO the Eagles will hold up to more abuse... this will be a great test however!
Mike Huml
Slowboy -
I never mentioned "lower revs" or "same stroke".
And we agree - the difference is the RR - so yes the 2.5l with the same length rod is at a disadvantage to a 2.0l, the same H beams in a 2.0l in theory will indeed hold more HP.
Are we on the same page or did I miss something?
Mike Huml
Slowboy -
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From: Sanford, FL!!!
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2.5l Torque!!
These numbers are with a GT28RS with a 34mm restrictor in the turbo in our rally car 
Torque
Boost
Oliver
om@slowboyracing.com
Torque
Boost
Oliver
om@slowboyracing.com
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From: Work - New York, Alaska, Mexico or the Caribbean. -Home - Tx Hill Country
Man, the 28 makes crazy torque. Especially when you factor in a restrictor that is less than 1.5 inches. Is the restrictor on the intake?
so you made ~500wtq @ only 23.3 psi with that GT28RS? Damn, I would love to see the torque with some higher boost on pump/meth...
This is probably a LOT more fun to drive on the street than a big turbo Evo...
How do you think the stocker 16g would have done (torque-wise) at that boost level (23psi)?
on the 2.5L testing! Keep it coming!
This is probably a LOT more fun to drive on the street than a big turbo Evo...
How do you think the stocker 16g would have done (torque-wise) at that boost level (23psi)?
on the 2.5L testing! Keep it coming!
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From: Sanford, FL!!!
so you made ~500wtq @ only 23.3 psi with that GT28RS? Damn, I would love to see the torque with some higher boost on pump/meth...
This is probably a LOT more fun to drive on the street than a big turbo Evo...
How do you think the stocker 16g would have done (torque-wise) at that boost level (23psi)?
on the 2.5L testing! Keep it coming!
This is probably a LOT more fun to drive on the street than a big turbo Evo...
How do you think the stocker 16g would have done (torque-wise) at that boost level (23psi)?
on the 2.5L testing! Keep it coming!Oliver
om@slowboyracing.com