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Spud Miller's Cave / Re: Tune up question
« on: June 26, 2018, 12:33:41 PM »
Just for fun....Here is a video of the final on Sunday from the gopro
FEDs Forever!
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Spud Miller's Cave / Re: Tune up question
« on: June 26, 2018, 11:59:55 AM »Chris, glad you were able to get into he show this last weekend!
As far as the pill size see below
55 has an area of .002376
69 has an area of .003739
Which equals an area of .006115
88 has an area of .006082
89 has an area of .006221
Now this is just using math not real world flow.
Paul, This is what I was looking for. A solid starting point. I am going to set it up with a 88 and not run the highspeed to see what it does. I have a feeling it will land around 90. We have ordered a DataMaxx system and will have it on the car the next time we go out. hopefully in 2 weeks or as my schedule allows. This should help me nail it down as well as help setting up the highspeed once I get the main set.
Thanks again Paul! I owe you a beer.......or 2
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Spud Miller's Cave / Re: Tune up question
« on: June 26, 2018, 10:47:12 AM »Then the next thing would be to try a bigger how pressure pill or a secondary bypass (somewhere after the pump) set at a higher pressure relief.
What you have is low pressure bypass (probably set between 9-15 lbs.), now you need a true high speed lean-out bypass that will take more fuel away down track and keep the car pulling to the end.
I am looking to land on what a starting point for what would be for a main pill that would return the same amount I am currently returning with the main and highspeed combined. This way I can use the main as intended. That would allow me to use the highspeed as it is intended. Example what I am talking about is, if my main is a #69. How much do I need to increase it to flow as much as a #69 + #55 Which is my highspeed) Would a #73 flow the same? Is there a formula to figure this?
Denverflathead, Spud was my next call as he originally flow this system for me. Great idea to have both pills flowed.
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Spud Miller's Cave / Re: Tune up question
« on: June 26, 2018, 10:31:23 AM »Then the next thing would be to try a bigger how pressure pill or a secondary bypass (somewhere after the pump) set at a higher pressure relief.
What you have is low pressure bypass (probably set between 9-15 lbs.), now you need a true high speed lean-out bypass that will take more fuel away down track and keep the car pulling to the end.
I am looking to land on what a starting point for what would be for a main pill that would return the same amount I am currently returning with the main and highspeed combined. This way I can use the main as intended. That would allow me to use the highspeed as it is intended. Example what I am talking about is, if my main is a #69. How much do I need to increase it to flow as much as a #69 + #55 Which is my highspeed) Would a #73 flow the same? Is there a formula to figure this?
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Spud Miller's Cave / Re: Tune up question
« on: June 26, 2018, 08:21:45 AM »
The timing is locked in at 38* I have tried other settings and this is where it likes it the best.
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Spud Miller's Cave / Tune up question
« on: June 26, 2018, 07:54:21 AM »
Ok experts, I need some advise. Last year we spent a lot of time trying to find our tune up. A VERY long story short. we were stuck in the 8.00-8.10 range trying different tunes. At the end of the year we were able to get a best of 7.90 @ 166. We went to the dyno after the season and did some tuning. found more power by landing on a tune up "close" to what we had. This season we have gone out testing and have not been able to get back to the 7.90 range and again were stuck in the 8's. This past weekend was the oldies but goodies race at woodburn Oregon. In order to qualify we needed to be into the 7's. After struggling in testing on Friday night test and tune, Paul New came over to offer his advise. His words of wisdom was "put your 7.90 tune back in!" xxxx, Why didn't I think of that!!! Saturday qualifying we went out with our 7.90 tune in it and lo and behold we ran a 7.84 at 169!! (thanks for waking me up Paul!!). We are now qualified for the B field. Great!! This tune took us all the way to the final on Sunday!! We lost the final but only by a very slim margin. Math worked out to .003 of a second loss. It was awesome!! Great race!!
Here is my question. The tune up is where I need help. Don't laugh its out there. The main pill is a 69. running a high speed bypass with a 55 pill. the highspeed opens at the hit so the entire run is on the main pill as well as the highspeed. The plugs show good heat (still a little rich). My question is. How do I figure out what main pill will get me to the 2 combined pills so I can get back to a correct tune up?
"note to self, Don't tune with dyno!!"
415 small block chevy
hilborn 2 3/4 stack
Again In want to thank Paul for his help!! We had a great weekend
Here is my question. The tune up is where I need help. Don't laugh its out there. The main pill is a 69. running a high speed bypass with a 55 pill. the highspeed opens at the hit so the entire run is on the main pill as well as the highspeed. The plugs show good heat (still a little rich). My question is. How do I figure out what main pill will get me to the 2 combined pills so I can get back to a correct tune up?
"note to self, Don't tune with dyno!!"
415 small block chevy
hilborn 2 3/4 stack
Again In want to thank Paul for his help!! We had a great weekend
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Spud Miller's Cave / Re: Advise on Nitro tune
« on: May 22, 2017, 06:34:05 AM »
Update,
Went to the track on Friday for some test and tune. I went with 15% mix, A 80 pill and set timing to 38*. First pass was 8.25@163. Plugs showed really wet. On the next pass I left everything as is and put 20% in the tank. That pass it went 8.00 @ 164. Plugs now showed good heat with 2 threads. On the next pass I bumped the timing to 40 (on the advise of a trusted racer) It ran a 7.98 @ 167. On the last pass of the day I didn't change anything because I wanted to back up. At launch when the front end came up it went left and I had to drive it back into the groove, That pass was a 8.00 @ 165. Leaving off Idle as Dreracecar suggested made a big difference and is how we will leave from now on. With this round of testing I have noticed another problem. ALL our runs are ending with a top speed of around 165 with different et's. we are only gaining 30mph in the 2nd half of the track. I did some calculations and it seems we have 12% slippage in the converter which is too high. I believe our power band is too low. Finish line rpm is 8500. We are going to head to the dyno to get some actual numbers and get this thing set up properly. I know....what a concept.
Again I want to thank everybody for their knowledge and advise!!
Went to the track on Friday for some test and tune. I went with 15% mix, A 80 pill and set timing to 38*. First pass was 8.25@163. Plugs showed really wet. On the next pass I left everything as is and put 20% in the tank. That pass it went 8.00 @ 164. Plugs now showed good heat with 2 threads. On the next pass I bumped the timing to 40 (on the advise of a trusted racer) It ran a 7.98 @ 167. On the last pass of the day I didn't change anything because I wanted to back up. At launch when the front end came up it went left and I had to drive it back into the groove, That pass was a 8.00 @ 165. Leaving off Idle as Dreracecar suggested made a big difference and is how we will leave from now on. With this round of testing I have noticed another problem. ALL our runs are ending with a top speed of around 165 with different et's. we are only gaining 30mph in the 2nd half of the track. I did some calculations and it seems we have 12% slippage in the converter which is too high. I believe our power band is too low. Finish line rpm is 8500. We are going to head to the dyno to get some actual numbers and get this thing set up properly. I know....what a concept.
Again I want to thank everybody for their knowledge and advise!!
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Spud Miller's Cave / Re: Advise on Nitro tune
« on: May 18, 2017, 06:00:01 AM »
Spud,
Yes the toluene was there from the start. When I tore the motor down I did take note that there was no indication of detonation, it just simply ran lean. We leave the line on the trans break at 4000 rpm. I will try leaving off idle which is something I wanted to try anyway. I am going to start over with the tune and be cautious while making 1 change at a time.
Thanks for the replies and good advise. We are heading to the track tomorrow for some test and tune to try to reach the 7's
Yes the toluene was there from the start. When I tore the motor down I did take note that there was no indication of detonation, it just simply ran lean. We leave the line on the trans break at 4000 rpm. I will try leaving off idle which is something I wanted to try anyway. I am going to start over with the tune and be cautious while making 1 change at a time.
Thanks for the replies and good advise. We are heading to the track tomorrow for some test and tune to try to reach the 7's
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Spud Miller's Cave / Re: Advise on Nitro tune
« on: May 16, 2017, 02:17:13 PM »
dreracecar, Ya I know. Only one change at a time. We only had time for 1 more run that day and I pushed it........Lesson learned!!!
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Spud Miller's Cave / Re: Advise on Nitro tune
« on: May 16, 2017, 09:15:37 AM »
We run a MSD Promag set up by spud. It is showing 2-3 threads. High speed bypass is turned around and has been. Hillborn pump (also set up by spud).
I feel that a 80 pill is plenty rich going off of prior runs on methanol.
I feel that a 80 pill is plenty rich going off of prior runs on methanol.
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Spud Miller's Cave / Advise on Nitro tune
« on: May 16, 2017, 06:27:39 AM »
Spud,
I need so advise on which direction to go on our tune. Our set up is, SBC with 415 cubic inch, AFR heads, Hillborn Stack Injection, Our normal tune on methanol is timing at 38*, 85 pill. We can run a very consistent 8.00 with this tune. In order to try to break into the 7's decided to run some nitro this year. I started out with 20% to get a feel for it. I put the timing back to 32* and put a 80 pill in.It ran a 8.30 out of the gate (kinda what I expected). On the next pass I set the timing to 36* and put the 85 pill back in. On the next pass it was running like a scalded dog on the first half of the track (best numbers so far) but second half of the track it was slow but still ran a 8.00. After we got back to the pits I knew something was wrong and I was right. It burned both head gaskets (copper) between the two center cylinders, also burned the electrode off 1 spark plug. I mixed the nitro by volume then checked it with a hydrometer then added 1 qt of toluene for 5 gallons. I have since repaired the damage but this leaves me with a choice and I don't want to get this wrong again.
Do I
1, Run the same 85 pill with less timing
2, Run the 80 pill with more timing
3, Run 25% with the 80 pill and 36* -38* timing
I'm just trying to be carefull on what I put in to it. We need to get into the 7's in order to run with the group but at the same time I don't want to burn it up.
Oh sorry, It also is running 14.3 compression (I know its high)
I need so advise on which direction to go on our tune. Our set up is, SBC with 415 cubic inch, AFR heads, Hillborn Stack Injection, Our normal tune on methanol is timing at 38*, 85 pill. We can run a very consistent 8.00 with this tune. In order to try to break into the 7's decided to run some nitro this year. I started out with 20% to get a feel for it. I put the timing back to 32* and put a 80 pill in.It ran a 8.30 out of the gate (kinda what I expected). On the next pass I set the timing to 36* and put the 85 pill back in. On the next pass it was running like a scalded dog on the first half of the track (best numbers so far) but second half of the track it was slow but still ran a 8.00. After we got back to the pits I knew something was wrong and I was right. It burned both head gaskets (copper) between the two center cylinders, also burned the electrode off 1 spark plug. I mixed the nitro by volume then checked it with a hydrometer then added 1 qt of toluene for 5 gallons. I have since repaired the damage but this leaves me with a choice and I don't want to get this wrong again.
Do I
1, Run the same 85 pill with less timing
2, Run the 80 pill with more timing
3, Run 25% with the 80 pill and 36* -38* timing
I'm just trying to be carefull on what I put in to it. We need to get into the 7's in order to run with the group but at the same time I don't want to burn it up.
Oh sorry, It also is running 14.3 compression (I know its high)
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Spud Miller's Cave / Dyno shops
« on: February 01, 2016, 06:09:07 AM »
Spud, can you recommend a Dyno shop in our area (Salem/Eugene)?
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