Build V2.5
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
I run a very similar combo to this.
10.2:1 364ci, LSA heads with the wing removed. (Ferrea hollow/Inconel vales, BTR Springs, Stock rockers), Stock LS3 intake and TB, YSI with 10 rib drive and 2.75" pulley. Cam specs are damn close to yours as well. I have NO issues making 1050+ whp regardless of the dyno with this setup on 93/Meth. I really don't think your cam is the issue and I know the heads are not.
10.2:1 364ci, LSA heads with the wing removed. (Ferrea hollow/Inconel vales, BTR Springs, Stock rockers), Stock LS3 intake and TB, YSI with 10 rib drive and 2.75" pulley. Cam specs are damn close to yours as well. I have NO issues making 1050+ whp regardless of the dyno with this setup on 93/Meth. I really don't think your cam is the issue and I know the heads are not.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
With my YSI I am 19.5 lbs boost. On the dyno with no meth say 135-140. With meth showed around 70 if I remember right, but as we know spraying on the sensor this cant be too accurate.
Drifting
Joined: Dec 2003
Posts: 1,755
Likes: 88
From: Pearland Texas
Yeah Jeff that is the stuff I was wanting to know. But did you put new springs on this time around? Did he re-check the spring pressures? They don't last forever is my point. What intake valves are you running on those heads? That's a big valve, Min it would need to be a Hollow stem stainless valve. Something under 100 grams to be able to control them in higher RPM's with those springs. Just a few things I was wanting to know before moving on to something else. Because I'm thinking it more along the lines of valve train instability. But LMK what you find. Got my technical side curious. GL!
Melting Slicks
Joined: Oct 2007
Posts: 2,569
Likes: 170
Just to bring up a point here. My Ti trim setup which is being slightly overspun above 6300rpm was seeing 128* IAT on the dyne with no meth. The same setup out on the road in 75* temps was hitting 150* at the top of 3rd and 4th gears. I was avoiding it but will be adding meth. I am also running ported LSA heads with hollow stem intakes and BTR springs, but far less boost.
Pro
Joined: Apr 2015
Posts: 580
Likes: 44
I have two 15gph meth nozzles about 6" from my IAT sensor and I don't think I have ever seen IAT's of more than 95 degrees at the top of a pull regardless of how nasty it is outside. Usually they are at least 10-15 degrees sub ambient. I did a bunch of pulls on the street last weekend and IAT's never went above 85 degrees up top. As soon as the meth starts to spray the IAT's drop dramatically. I have two 15 gph post intercooler and one 3gph nozzle pre blower (spays into the impeller)... System is completely hard piped out of 304 Stainless. I also have two Tial Q 50mm bov's venting to atmosphere with 2# springs pre intercooler, no preheating going on.
Last edited by SquatchMachining; May 11, 2015 at 11:13 AM.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
I have two 15gph meth nozzles about 6" from my IAT sensor and I don't think I have ever seen IAT's of more than 95 degrees at the top of a pull regardless of how nasty it is outside. Usually they are at least 10-15 degrees sub ambient. I did a bunch of pulls on the street last weekend and IAT's never went above 85 degrees up top. As soon as the meth starts to spray the IAT's drop dramatically. I have two 15 gph post intercooler and one 3gph nozzle pre blower (spays into the impeller)... System is completely hard piped out of 304 Stainless. I also have two Tial Q 50mm bov's venting to atmosphere with 2# springs pre intercooler, no preheating going on.
Clearly temps on a full pull like a quarter mile are going to be higher than a short dyno pull.
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Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
Yeah Jeff that is the stuff I was wanting to know. But did you put new springs on this time around? Did he re-check the spring pressures? They don't last forever is my point. What intake valves are you running on those heads? That's a big valve, Min it would need to be a Hollow stem stainless valve. Something under 100 grams to be able to control them in higher RPM's with those springs. Just a few things I was wanting to know before moving on to something else. Because I'm thinking it more along the lines of valve train instability. But LMK what you find. Got my technical side curious. GL!
It's running Ferrea hollow stainless intake and super alloy exhaust.
I'm not to sure what spring pressure or valvetrain setup is needed, so I've let the cylinder head porter (1st motor) and engine builder (2nd motor) handle all that. I did degree my 1st cam, but that was it.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Running the same springs and almost same valves, although on aftermarket heads. They work fine right to 7000+. Doubt that is an issue.
I am not an expert but I don't see meth adding power without tuning for it unless you are losing power (pulling timing) due to IAT temps, and the meth keeps them down.
I am not an expert but I don't see meth adding power without tuning for it unless you are losing power (pulling timing) due to IAT temps, and the meth keeps them down.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,342
From: Gilbert AZ
18-19psi, made 1018-1020rwhp, M10 and M15 nozzle, saw solid 80F intake temps through dyno run, meth pre IAT about 6"
21-22psi, made 1089rwhp, intake temps would hit 110ish at end of dyno run
23-24psi, maxed dyno out with any timing over 11 degrees, 11 degrees made 1116rwhp, IATs 120ish
At 1/2 mile, with m10/15 saw ~120-130F at end of 1/2 mile pull, topping out 4th gear and well into 5th.
Then after 1 run IATs went to 170-180F by top of 3rd. Couldn't figure this out. Got home, and lower pipe moved about 6" was completely pinched shut from the outlet of the blower. Basically a big restriction out of the blower, sky rocketed IATs. Just goes to show how something like a restriction in the system can cause high IATs. Same goes for inlet side. Dirty air filter makes blower work harder, causes IATs to rise.
Now running twin m15s nozzles, but haven't messed with it yet. Street pulls goes to -20-30F below ambient in 3rd gear pulls but haven't had room or time to mess with it yet.
21-22psi, made 1089rwhp, intake temps would hit 110ish at end of dyno run
23-24psi, maxed dyno out with any timing over 11 degrees, 11 degrees made 1116rwhp, IATs 120ish
At 1/2 mile, with m10/15 saw ~120-130F at end of 1/2 mile pull, topping out 4th gear and well into 5th.
Then after 1 run IATs went to 170-180F by top of 3rd. Couldn't figure this out. Got home, and lower pipe moved about 6" was completely pinched shut from the outlet of the blower. Basically a big restriction out of the blower, sky rocketed IATs. Just goes to show how something like a restriction in the system can cause high IATs. Same goes for inlet side. Dirty air filter makes blower work harder, causes IATs to rise.
Now running twin m15s nozzles, but haven't messed with it yet. Street pulls goes to -20-30F below ambient in 3rd gear pulls but haven't had room or time to mess with it yet.
Pro
Joined: Apr 2015
Posts: 580
Likes: 44
I am running the EXACT same springs and Exact same valves. Ferrea Hollow and Super Alloy Exhaust, I have no issues with pulling past 7000 RPM. Valves show not signs of float nor do my logs. I would seriously weed out a head or cam issue at this point.
Have you done a leak down test on the engine?
Have you done a leak down test on the engine?
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
I am running the EXACT same springs and Exact same valves. Ferrea Hollow and Super Alloy Exhaust, I have no issues with pulling past 7000 RPM. Valves show not signs of float nor do my logs. I would seriously weed out a head or cam issue at this point.
Have you done a leak down test on the engine?
Have you done a leak down test on the engine?
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
18-19psi, made 1018-1020rwhp, M10 and M15 nozzle, saw solid 80F intake temps through dyno run, meth pre IAT about 6"
21-22psi, made 1089rwhp, intake temps would hit 110ish at end of dyno run
23-24psi, maxed dyno out with any timing over 11 degrees, 11 degrees made 1116rwhp, IATs 120ish
At 1/2 mile, with m10/15 saw ~120-130F at end of 1/2 mile pull, topping out 4th gear and well into 5th.
Then after 1 run IATs went to 170-180F by top of 3rd. Couldn't figure this out. Got home, and lower pipe moved about 6" was completely pinched shut from the outlet of the blower. Basically a big restriction out of the blower, sky rocketed IATs. Just goes to show how something like a restriction in the system can cause high IATs. Same goes for inlet side. Dirty air filter makes blower work harder, causes IATs to rise.
Now running twin m15s nozzles, but haven't messed with it yet. Street pulls goes to -20-30F below ambient in 3rd gear pulls but haven't had room or time to mess with it yet.
21-22psi, made 1089rwhp, intake temps would hit 110ish at end of dyno run
23-24psi, maxed dyno out with any timing over 11 degrees, 11 degrees made 1116rwhp, IATs 120ish
At 1/2 mile, with m10/15 saw ~120-130F at end of 1/2 mile pull, topping out 4th gear and well into 5th.
Then after 1 run IATs went to 170-180F by top of 3rd. Couldn't figure this out. Got home, and lower pipe moved about 6" was completely pinched shut from the outlet of the blower. Basically a big restriction out of the blower, sky rocketed IATs. Just goes to show how something like a restriction in the system can cause high IATs. Same goes for inlet side. Dirty air filter makes blower work harder, causes IATs to rise.
Now running twin m15s nozzles, but haven't messed with it yet. Street pulls goes to -20-30F below ambient in 3rd gear pulls but haven't had room or time to mess with it yet.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
Pro
Joined: Apr 2015
Posts: 580
Likes: 44
I like the Airaid Track day filter, it seems to flow very well and still catches particulates. The race day filter is nothing but wire mesh, I would be hesitant to run that on the street or at a track event personally. I know people do it, but its not for me.
I probably missed it, but what boost level were you making for your 1000+ pull?