What's the verdict on the smaller SC pulley?
#151
Senior Member
Alrighty then, tried this last night on the road, and results are as follows.
Normal cruising highway speeds of 70mph the IAT was stable at 36'C (97'F)
Selected 3rd gear pull to 6000RPM and IAT rose to 63'C (145'F) let off the pedal and after about 2-3secs the temp started to drop, at which point started timing and took about 18sec to drop to 51'C (124'F) To get back to where we started at 36'C (97'F) took probably around 1 min..
Does it sound like cooling issues, or pretty normal for a stock cooling system?
Normal cruising highway speeds of 70mph the IAT was stable at 36'C (97'F)
Selected 3rd gear pull to 6000RPM and IAT rose to 63'C (145'F) let off the pedal and after about 2-3secs the temp started to drop, at which point started timing and took about 18sec to drop to 51'C (124'F) To get back to where we started at 36'C (97'F) took probably around 1 min..
Does it sound like cooling issues, or pretty normal for a stock cooling system?
#153
Super Member
Hoe gaan dit boetie Is jy in Jo'burg of Kaapstad? Dit lyk soos Joburg.... Anyway, that gain is definitly off and if you are hitting temps of 180* F, that explains alot for the minimal mods you have. Have you split your cooling yet, and do you have air fuel and timing data? What does your dyno graph look like?
[/QUOTE=SavMan;5798950]Considering the short burst the temps are to high and the recovery is very poor. I would start by checking your IC circuit is bled properly and that there is a good solid flow to make sure there is no obstruction. You will probably be wise to invest in a new IC pump which you will likely need anyway if you do choose to split the system later.[/QUOTE]
Thanks will definitely be looking into this
Yes sorry I forgot to mention that. It was around 22'C (70'F)
#155
Super Member
Well according to torque android app which scans thru the obd port. Stock my boost level was at 0.4bar (6psi) and after pulley install it is now 0.5bar (7.2psi)
#157
Super Member
Yeah I did gain. Just way lower than expected. Should have been 20whp for pulley and 20whp for the tune but I only got 15whp. Anyway going to investigate this cooling issue and tackle, that one. What psi does a stock Car boost at seal level or with the supercharger pulley. Think I recall reading 11.6psi stock in some article. Am I really loosing 5.6psi being up at 5000' I know in flying with a normally aspirated engine You loose 1inch of manifold pressure for every 1000' climb in altitude
#158
MBWorld Fanatic!
Found this on Kenne Bell's website. Seems to be relevant:
So, when our blowers are rated at 11.6psi, as previously stated, is this a measure of absolute pressure + boost pressure or boost pressure alone? Also, is this measured for standards at sea level or higher? Does this mean that our cars make 26.3psi of absolute psi? How does the Torque app measure the loss of absolute pressure?
---------
Then there is this that I found. If this is correct, then the following should apply to you at 5,000ft above sea level:
Atmospheric pressure @ sea level = 101kpa
Atmospheric pressure @ 5,000ft = 84.3kpa
The ratio is 83.5% or a 16.5% drop in atmospheric pressure.
If this guy's post I found above is true, then your car should make 9.7psi or 83.5% of the original 11.6.
(Pressure values pulled from here)
How much boost do I lose per 1000' elevation? None. Our supercharger always produces it's rated boost over atmospheric pressure. Approx. .5 psi per 1000' of atmospheric pressure is lost due to elevation. Boost plus atmospheric pressure is called absolute pressure. 14.7 psi at sea level +5 psi boost = 19.7 absolute psi.
---------
Then there is this that I found. If this is correct, then the following should apply to you at 5,000ft above sea level:
Atmospheric pressure @ sea level = 101kpa
Atmospheric pressure @ 5,000ft = 84.3kpa
The ratio is 83.5% or a 16.5% drop in atmospheric pressure.
If this guy's post I found above is true, then your car should make 9.7psi or 83.5% of the original 11.6.
(Pressure values pulled from here)
Last edited by HeissRod; 10-03-2013 at 06:24 PM.
#159
MBWorld Fanatic!
Joined: Oct 2011
Posts: 2,279
Likes: 0
Received 26 Likes
on
21 Posts
From: A to the Z (the state)
'06 E55
I like the dashdaq but the sample rate from the car is not quite where I'd like it to be. Are you getting your rpm through obd2 or elsewhere? Also with the meth what size nozzle are you running and where is it placed? 50/50? Thanks. Those are crazy good IAT's. I have to resort to stuffing it with ice lol
I have a 12 gpm nozzle, installed post-supercharger. Pretty much way down below the TB. Bramage has a 10gpm nozzle and you see his IATs in that other thread.
#160
Super Member
Found this on Kenne Bell's website. Seems to be relevant:
So, when our blowers are rated at 11.6psi, as previously stated, is this a measure of absolute pressure + boost pressure or boost pressure alone? Also, is this measured for standards at sea level or higher? Does this mean that our cars make 26.3psi of absolute psi? How does the Torque app measure the loss of absolute pressure?
---------
Then there is this that I found. If this is correct, then the following should apply to you at 5,000ft above sea level:
Atmospheric pressure @ sea level = 101kpa
Atmospheric pressure @ 5,000ft = 84.3kpa
The ratio is 83.5% or a 16.5% drop in atmospheric pressure.
If this guy's post I found above is true, then your car should make 9.7psi or 83.5% of the original 11.6.
(Pressure values pulled from here)
So, when our blowers are rated at 11.6psi, as previously stated, is this a measure of absolute pressure + boost pressure or boost pressure alone? Also, is this measured for standards at sea level or higher? Does this mean that our cars make 26.3psi of absolute psi? How does the Torque app measure the loss of absolute pressure?
---------
Then there is this that I found. If this is correct, then the following should apply to you at 5,000ft above sea level:
Atmospheric pressure @ sea level = 101kpa
Atmospheric pressure @ 5,000ft = 84.3kpa
The ratio is 83.5% or a 16.5% drop in atmospheric pressure.
If this guy's post I found above is true, then your car should make 9.7psi or 83.5% of the original 11.6.
(Pressure values pulled from here)
Anyway, I been checking on my whole dilemma and all the numbers works out with what I am seeing pre-pulley installation and after supercharger pulley install and the claims. Everything seems legit. I spoke to my tuner last night and he says due to our altitude we loose 0.3 bar, which is around 5psi boost being up at 5000' elevation. So I am currently making 8.2psi measured on torque pro app. Prior install stock I was at 6.2 psi, so the supercharger pulley is making 2psi. So to work from sea level where a stock car makes 11.6psi plus the pulley install of 2psi puts the boost at 13.6psi, - the 5psi (0.3bar) being at 5000' and I am at 8.7 psi which on the torque pro app last night showed me at 8.2psi. So unfortunately I am just paying the price of being a mile high As a matter of interest another person posted his car at sea level using this same setup and the same torque program and he is boosting 13.7psi.
Last edited by C32owner; 10-06-2013 at 02:59 AM.
#162
+35 deg c IAT timing retarded 3.5 deg
+45 deg c IAT timing retarded 6.3 deg
+65 deg c IAT timing retarded 9.6 deg
So you hit all 3
Try a 3rd gear pull on the road even if you can't top out look for how quickly the IAT's recover when you lift off you want them to return within 3 secs.
+45 deg c IAT timing retarded 6.3 deg
+65 deg c IAT timing retarded 9.6 deg
So you hit all 3
Try a 3rd gear pull on the road even if you can't top out look for how quickly the IAT's recover when you lift off you want them to return within 3 secs.
#164
MBWorld Fanatic!
Anyone able to convert revs to boost? It'd be nice to get a solid idea of what pulley revs to boost correlates as.
#165
MBWorld Fanatic!
#168
I just installed supercharger pulley and tune, car runs strong and around town driving has smoothed out a bit. Your pulley should slide right on with minimal force. Helps if both shaft and pulley are same temp.... Use the two extra shims that come with the pulley. Torque and lock tight that supercharger bolt , tune the biatch and done. Since I am basically stock with minor mods should be fine. The guys really pushing high HP numbers and beating the crap outta their cars do have problems, I'll let you know if I do. EC great service and support for their product. As far as modifying cars goes I've been doing it since I could drive.. 21 years ago. When working on my 5.0 back in the days I knew in messing with timing, fuel pressure etc. could have bad results, it's part if tinkering Be good to your motor listen to her and you should be good. Beat her down run her ragged and you are screwed. Been on this forum for over a year, great advice.