Drivetrain Are these normal boost values or do I Have a leak?
#1
Are these normal boost values or do I Have a leak?
Hi guys!! I´m currently doing a custom tune, and doing some logs on the road, and we think the car has a boost leak because we are only seeing 11.5 PSI of MAPpsi at 5000RPM, are these normal values for my mods?
-SparkPlugs NGK Iridium BKR7EIX
-Panel K&N Filter
-Intercooler GRS Black
-17% SC Pulley
- Stock Head
-Cam Newman PH2 250/400 (I believe its also known as RMW Dominator CAM)
-Injectors Bosch 550cc
-Stock headers with both stock pre-cat and cat
-CatBack 63.5mm Direnza non resonated
I would really like to know what kind of values are you guys doing with similar mods before starting the search for some kind of boost leak or belt slipping.
Thank you so much, any help is appreciated.
3G Pull to 5500rpm
-SparkPlugs NGK Iridium BKR7EIX
-Panel K&N Filter
-Intercooler GRS Black
-17% SC Pulley
- Stock Head
-Cam Newman PH2 250/400 (I believe its also known as RMW Dominator CAM)
-Injectors Bosch 550cc
-Stock headers with both stock pre-cat and cat
-CatBack 63.5mm Direnza non resonated
I would really like to know what kind of values are you guys doing with similar mods before starting the search for some kind of boost leak or belt slipping.
Thank you so much, any help is appreciated.
3G Pull to 5500rpm
#2
#3
Thanks
#4
Yea, don't agree DaGhost.
While the larger volume of the cooler will cause a slightly longer time to "get"...to pressure, the engine is still the plug and with a "plug" in the system, full pressure should still be achieved at a given rpm.
Like I say, it may just take a second or so longer to get full pressure. I'd still expect at least 12+ / 13 lbs. with that intercooler.
But I do not know about the cam spec's. If the new cam's duration or overlap is longer than the stock cams spec's...THAT will cause the pressure to be low.
Mike
While the larger volume of the cooler will cause a slightly longer time to "get"...to pressure, the engine is still the plug and with a "plug" in the system, full pressure should still be achieved at a given rpm.
Like I say, it may just take a second or so longer to get full pressure. I'd still expect at least 12+ / 13 lbs. with that intercooler.
But I do not know about the cam spec's. If the new cam's duration or overlap is longer than the stock cams spec's...THAT will cause the pressure to be low.
Mike
#5
6th Gear
iTrader: (10)
If its this intercooler, no these boost levels not normal. These top mounted intercoolers like most aftermarket and DFIC style its more of an issue of not being able to direct the air flow as well as stock, and recovery time after heat soak.
Thats a significan boost loss.
I have similar mods sans the cam and pushing 17-18lbs all day.
I would use a quick tie to secure the BPV in a closed position.
Then see what happens....
Thats a significan boost loss.
I have similar mods sans the cam and pushing 17-18lbs all day.
I would use a quick tie to secure the BPV in a closed position.
Then see what happens....
#6
Hi guys!! I´m currently doing a custom tune, and doing some logs on the road, and we think the car has a boost leak because we are only seeing 11.5 PSI of MAPpsi at 5000RPM, are these normal values for my mods?
-SparkPlugs NGK Iridium BKR7EIX
-Panel K&N Filter
-Intercooler GRS Black
-17% SC Pulley
- Stock Head
-Cam Newman PH2 250/400 (I believe its also known as RMW Dominator CAM)
-Injectors Bosch 550cc
-Stock headers with both stock pre-cat and cat
-CatBack 63.5mm Direnza non resonated
I would really like to know what kind of values are you guys doing with similar mods before starting the search for some kind of boost leak or belt slipping.
Thank you so much, any help is appreciated.
3G Pull to 5500rpm
-SparkPlugs NGK Iridium BKR7EIX
-Panel K&N Filter
-Intercooler GRS Black
-17% SC Pulley
- Stock Head
-Cam Newman PH2 250/400 (I believe its also known as RMW Dominator CAM)
-Injectors Bosch 550cc
-Stock headers with both stock pre-cat and cat
-CatBack 63.5mm Direnza non resonated
I would really like to know what kind of values are you guys doing with similar mods before starting the search for some kind of boost leak or belt slipping.
Thank you so much, any help is appreciated.
3G Pull to 5500rpm
The following users liked this post:
Eurothrasher (02-19-2021)
#7
If its this intercooler, no these boost levels not normal. These top mounted intercoolers like most aftermarket and DFIC style its more of an issue of not being able to direct the air flow as well as stock, and recovery time after heat soak.
Thats a significan boost loss.
I have similar mods sans the cam and pushing 17-18lbs all day.
I would use a quick tie to secure the BPV in a closed position.
Then see what happens....
Thats a significan boost loss.
I have similar mods sans the cam and pushing 17-18lbs all day.
I would use a quick tie to secure the BPV in a closed position.
Then see what happens....
I have not quick tied the BPV yet, but I did the hand test to see if it had good pressure and if it would bounce back and seemed fine
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#8
Yea, don't agree DaGhost.
While the larger volume of the cooler will cause a slightly longer time to "get"...to pressure, the engine is still the plug and with a "plug" in the system, full pressure should still be achieved at a given rpm.
Like I say, it may just take a second or so longer to get full pressure. I'd still expect at least 12+ / 13 lbs. with that intercooler.
But I do not know about the cam spec's. If the new cam's duration or overlap is longer than the stock cams spec's...THAT will cause the pressure to be low.
Mike
While the larger volume of the cooler will cause a slightly longer time to "get"...to pressure, the engine is still the plug and with a "plug" in the system, full pressure should still be achieved at a given rpm.
Like I say, it may just take a second or so longer to get full pressure. I'd still expect at least 12+ / 13 lbs. with that intercooler.
But I do not know about the cam spec's. If the new cam's duration or overlap is longer than the stock cams spec's...THAT will cause the pressure to be low.
Mike
I already ordered a gates one, do you guys think it might be the culprit?
Also attached cam specs if it helps.
Thank you for the help guys!!! Really appreciate it
#9
My belt tensioner is on its way out, it squeals for about 2 min on the first start of the day then it shuts up.
I already ordered a gates one, do you guys think it might be the culprit?
Also attached cam specs if it helps.
Thank you for the help guys!!! Really appreciate it
I already ordered a gates one, do you guys think it might be the culprit?
Also attached cam specs if it helps.
Thank you for the help guys!!! Really appreciate it
#10
Thank you for the help, I'll update when the repair is made.
#11
Uploaded 2 pics, 1st is my own belt tensioner (No hole in sight) and second is how its suppose to be, pretty sure the new tensioner should do it, got a p1688 code aswell but no limp mode, and the crank pully was replaced not long ago
#12
Yea that is looking very weak. Replace the tensioner. They all need replacing at some point. Hope that resolves your issue.
The following users liked this post:
Eurothrasher (05-23-2020)
#14
the belt is pretty fresh compared with the tensioner, i think the belt has 10k on it
#16
#17
#18
12.9 Is the highest MAP value I have seen...
Yes 1PSI gain through the rpms, and i get boost much sooner that before the new tensioner, pulleys and belt
#19
Hi guys, I´m sorry for digging up my own thread again.
But i´m yet to solve this problem!
Today I installed a detroit tuned BPV, I gained about 0.5 PSI across the rev range but unfortunatly the problem continues.
I get Peak Boost (13.4PSI) at 5600RPM and then the boost goes down to 12.3 and stays there till the rev limiter.
I dont know where to find the missing boost, with a 17% pulley i should be pushing 16 PSI.
Any ideas where to turn to next?
Already did belt, tensioner, BPV, IC Boots.
Any help is apreciated
As you can see after 5600RPM where I hit 13.5PSI the it drops to 12.4 and stays about there till the end
But i´m yet to solve this problem!
Today I installed a detroit tuned BPV, I gained about 0.5 PSI across the rev range but unfortunatly the problem continues.
I get Peak Boost (13.4PSI) at 5600RPM and then the boost goes down to 12.3 and stays there till the rev limiter.
I dont know where to find the missing boost, with a 17% pulley i should be pushing 16 PSI.
Any ideas where to turn to next?
Already did belt, tensioner, BPV, IC Boots.
Any help is apreciated
As you can see after 5600RPM where I hit 13.5PSI the it drops to 12.4 and stays about there till the end
Last edited by Juve; 02-19-2021 at 11:37 AM. Reason: logs
#21
Haven't dynoed it yet, but should be around 230
#23
At idle im reading steady 16-17inHG
Yeah i agree that that is a factor but shouldn´t the boost increase all the way up till the rev lim?
Should it be peaking at 5500rpm?
Should it be peaking at 5500rpm?
#24
6th Gear
iTrader: (10)
And that low at idle I'm thinking maybe boost leak as that is a good way to gauge that....maybe cracked line for the FPR from right side of horn ? My last boost leak I found to be missing metal gasket at left side supercharger horn....
Who did your tune ?
Bytetronik has some experience with modded R53's, Bytetronik maybe he can chime in.
#25
No your right, boost should probably continue to climb up to 6500 or 7000 depending on your tune setting.
And that low at idle I'm thinking maybe boost leak as that is a good way to gauge that....maybe cracked line for the FPR from right side of horn ? My last boost leak I found to be missing metal gasket at left side supercharger horn....
Who did your tune ?
Bytetronik has some experience with modded R53's, Bytetronik maybe he can chime in.
And that low at idle I'm thinking maybe boost leak as that is a good way to gauge that....maybe cracked line for the FPR from right side of horn ? My last boost leak I found to be missing metal gasket at left side supercharger horn....
Who did your tune ?
Bytetronik has some experience with modded R53's, Bytetronik maybe he can chime in.
I'll Check the FPR lines!
Adrian CL tuned my car