LS1will

iTrader: (4)

"I do not care about street ability "

I have a 98 c5 Vette with LQ4 stock bottom end... Healthy Cam only... 315/45/16 mt drag radial 26" tall ... Running an 11.8 in the 1/4 with 3600stall and 3.42 gears


My goals- high 10s on motor and 9s on 200 shot with cam only

Question is with a 4500 nitrous converter could I see high 10s ?
When I spray the 200shot will it blow through the converter?
Will it or will it not blow through the converter if I ramp the nitrous in with a progressive controller?

I will have fti converters spec my converter

Future mods will be some ported heads and maybe upping the shot 200-250-300? Ehhhh

jblankenship

iTrader: (5)

Not going to happen. 4000 PTC nitrous stall here, 3.73, 28" tire, 4l60e, 150-175, I'm about tapped out in the 1/4. That's shifting at 6500. Your shift point will also make a difference. I would leave the gears you have now. A 4500 nitrous converter is not going to get you tens. Nitrous converters are "tight" and very efficient. It needs the nitrous to flash the converter. If you get a nitrous converter it will not blow through the converter.

LS1will

iTrader: (4)

Why 3.42s over 3.90s?

Do you spray your nitrous without a progressive controller?

Do you spray through the shifts?

I was going to shift at 6800rpms

Btw we have more 1/8th mile tracks than 1/4 but 9s would be nice to see tho... But looking to move fast in the 1/8th

jblankenship

iTrader: (5)

You need to decide what you want 1/8 or 1/4. I do use a progressive controller but all the nitrous is on in less than one second and I leave on 50%. Yes I spray through the shifts. With 3.90 gears and 26" tires you will not make it to the finish line on a 1/4 mile track with a 200 hit of nitrous spraying out the hole. Now a 3.90, 28" tire, shifting a 6800, with 150-200 you will be close. The converter will also play into this as well. Keep in mind on the 1/8 mile track you will probably want to set the car up to not make a shift into the third gear just before the line. Mine does this about 50 foot before the 1/8 mile line, but I can hold it in second if needed, but I run 1/4 stuff.

murphinator

iTrader: (2)

LS1Will I like your style lol

Where part of your plan is to spend some money on a higher stall read through this thread:

https://ls1tech.com/forums/automatic...converter.html

maybe buying a convertor capable of being locked at wot could give you the mph to have your cake and eat it too (1/8 & 1/4 with 390's???) picked up 11mph just by being able to lock convertor.

you guys are both beyond where I am at but figured it would be worth mentioning - I could be missing a critical point.

LS1will

iTrader: (4)

I can do some 28" tall Hoosier slicks for those 3.90s

Just throwing some Ideas on the table - spraying 200 shot to an NA converter?

Ill just like the car to run Decent on motor...

LS1will

iTrader: (4)

Ima have to look more into that.... Ima call fti converters and have a talk with them tomorrow! Thanks

Circle-D_Brian

As stated, "nitrous converters" are typically tight but we have also seen customers lock a loose na specced converter on the gas. This requires some more intricate tuning.

redgto4u

iTrader: (8)

At what point would know you are blowing through?

Can that efficiency be logged with engine rpm vs trans input rpm?

Circle-D_Brian

% slip and shift drop are good indicators. Should be able to log this with tuning software.

-Brian

LS1will

iTrader: (4)

For what I'm trying to do what do you suggest?

NA converter?

Intricate tuning ? Depending on how much I shoot? How it's ramped in?

I'd like to have a 44-4500 stall and shooting between 200-300 spray

Circle-D_Brian

What I mean by intricate is you will have to do some testing to see where the car picks up when locked vs unlocked. I don't really have first hand experience with this but know it can be done. If you plan on spraying out of the hole, a traditional tighter nitrous converter may be the better bet. If you go this route, I would recommend something in the 245mm 3200 variety on motor. It will really come alive on the 250 -300 shot.

-Brian

jblankenship

iTrader: (5)

You are not going to be able to spray 2-300 on a NA converter. It is one or the other. Honestly this is why I like nitrous converters for street cars. Nice on the street and get busy at the track. Now I will tell you my (speced for my car) PTC nitrous 4000 converter has done 1.51 best on motor and 1.47 spraying on a progessed tune. THe other way is more motor and less nitrous and you can run more converter. Have you used nitrous before? And blowing through a converter will be a whole lot of RPM and not much mph. It's like a slipping clutch. Wallace racing has converter slip/efficiency calculators.
For example mine is:

NA: 5.726
N20: 10.649

LS1will

iTrader: (4)

That's not a bad 60' for a nitrous converter...
Am I trying to run too big of a stall converter?

Yes, I've sprayed my old cam only ls1 with an 150 shot

LS1will

iTrader: (4)

Single or triple disk converter guys?

Circle-D_Brian

Only way to know for sure is to try it out. That's what free stall changes are for Numbers we try to hit are about 800 rpm on the shift drop and less than 10% slip. If you spray once a year and are on motor the rest of the time, I say play with wot lockup and a loose converter. If you spray all the time get the dedicated nitrous converter.

-Brian

shortdog

iTrader: (1)

Not quite a 4500, but I'm spraying a 88N jet (250-300 shot) on a Yank SS4000 and took it like a champ! BUT, I'm also shifting at 7000 and going through the traps at 7300-7400 rpms! This was with 3.89s on 28" tires:

https://ls1tech.com/forums/nitrous-o...1-40-60-a.html

LS1will

iTrader: (4)

How you think the car would do if you went with a bigger stall like a 4500?

What you make on the dyno on motor? Also what kind of dyno?

A 10.7 1/4mile motor pass is badass with an tight nitrous stall!!!!

shortdog

iTrader: (1)

^Not sure since it depends on how it's built, your shift points, etc.

It haven't seen a dyno and never really cared to, as long as it flys at the track.

Thanks, but I don't consider it a tight stall neither. It pulls mid 1.4 60's on motor!

JakeFusion

iTrader: (7)

Was searching today and found this. I plan to spray a 150 shot on my Circle D 2E, which is about a 4200 stall. If the 150 is too much, may take it down to 100. But would love to keep the big stall and have it take a 150 shot on the stock motor...

When I build my motor at some point, I may be sending this back for a restall and going for a 200-250 hit on the gas. Would be in the 750rwhp range at that point, so a triple disk might be warrantied.