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vector · 12-09-2006, 12:06 PM

Ok.. here's what I need help with. Have a z6.. and a turbo kit (edelbrock) with a GT28R.. I have another block that I'm going to have decked and cleaned to build for this project. But I have no idea what range of boost I'm dealing with for that turbo. Obviously pointless to build for say, 13psi (for example) if the turbo can't push that.....
basically I want to know if anyone knows what kind of air this thing can blow so I can build engine accordingly (hopping for like 10-12psi..maybe more if I can build for it).
(current plans include machined crank, forged 8.5:1 pistons, eagle rods, and some head studs.. cause I just don't trust the bolts)
Also any other advice or tips reguarding building this motor would be helpful.. I've build motors before but never for boost so this is kind of a 1st time experience for me.
Any help would be much appreciated :P

Thank you

AHHVTEC · 12-09-2006, 03:35 PM

that turbo can go up to 20pis before it gets to hot

silver · 12-11-2006, 10:07 AM

Cutoff point looks to be about 36-37 lbs/min for this map.

reikoshea · 12-11-2006, 10:24 AM

i dunno about you, but i like my turbos to operate at the maximum effectively. So, i like ahh vtec's response of 20psi (notice the 77% look tops out at 2.4 meaning 14.7 + 5.6psi...20.3psi).

A stock z6 could probably get around 260-280 just because i dont think youll ever make it past 20lbs per minute on a d16...that puts you JUST above 20psi and around 60% efficiency.

silver · 12-11-2006, 11:17 AM

You don't exactly decide what efficiency island you fall on at PR 2.4. That'd have to be under the assumption that after you mapped your setup on the map you fall under there (and make slightly less than 30 lbs/min).

Under the general ASSumption that Honda motors generally have a fairly high VE from the stock, you guys will be placed more towards the right side of the flow map which is something to keep in consideration when looking at these things. Then again this is heresay and the best way to find out where you are on the map is to either calculate your airflow (assuming you know your VE at x rpm) or reverse-engineer it by logging airflow and pressure ratio and then plotting it on the map.

reikoshea · 12-11-2006, 11:19 AM

werd, thats why i kinda contradicted myself in the second half of the above post.

AHHVTEC · 12-11-2006, 11:41 AM

Quote:

Originally Posted by reikoshea

i dunno about you, but i like my turbos to operate at the maximum effectively. So, i like ahh vtec's response of 20psi (notice the 77% look tops out at 2.4 meaning 14.7 + 5.6psi...20.3psi).

A stock z6 could probably get around 260-280 just because i dont think youll ever make it past 20lbs per minute on a d16...that puts you JUST above 20psi and around 60% efficiency.

12-09-2006, 12:06 PM	#1
vector Junior Member Join Date: May 2004 Location: South Dakota Age: 28 Posts: 21 iTrader: 0 / 0% Ride: 94 Civic Dx hatch converted to Si Rep Power: 12	what boost to build for given a GT28R Ok.. here's what I need help with. Have a z6.. and a turbo kit (edelbrock) with a GT28R.. I have another block that I'm going to have decked and cleaned to build for this project. But I have no idea what range of boost I'm dealing with for that turbo. Obviously pointless to build for say, 13psi (for example) if the turbo can't push that..... basically I want to know if anyone knows what kind of air this thing can blow so I can build engine accordingly (hopping for like 10-12psi..maybe more if I can build for it). (current plans include machined crank, forged 8.5:1 pistons, eagle rods, and some head studs.. cause I just don't trust the bolts) Also any other advice or tips reguarding building this motor would be helpful.. I've build motors before but never for boost so this is kind of a 1st time experience for me. Any help would be much appreciated :P Thank you

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12-09-2006, 03:35 PM	#2
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 29 Posts: 11,356 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 268	that turbo can go up to 20pis before it gets to hot

12-11-2006, 10:07 AM	#3
silver Senior Member Join Date: Nov 2002 Location: St. Louis Age: 22 Posts: 697 iTrader: 0 / 0% Ride: 1998 Eclipse GSX Rep Power: 21	Cutoff point looks to be about 36-37 lbs/min for this map.

12-11-2006, 11:17 AM	#5
silver Senior Member Join Date: Nov 2002 Location: St. Louis Age: 22 Posts: 697 iTrader: 0 / 0% Ride: 1998 Eclipse GSX Rep Power: 21	You don't exactly decide what efficiency island you fall on at PR 2.4. That'd have to be under the assumption that after you mapped your setup on the map you fall under there (and make slightly less than 30 lbs/min). Under the general ASSumption that Honda motors generally have a fairly high VE from the stock, you guys will be placed more towards the right side of the flow map which is something to keep in consideration when looking at these things. Then again this is heresay and the best way to find out where you are on the map is to either calculate your airflow (assuming you know your VE at x rpm) or reverse-engineer it by logging airflow and pressure ratio and then plotting it on the map.

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what boost to build for given a GT28R