Dundon GT4/Spyder Race Header Group Buy
08-19-2016, 01:19 PM
#31
Race Director
I didn't calculate each RPM from the BGB thread graph, and I assume tune cost is the same, but is the roughly 10whp difference at 6500 RPM worth ~$1,720?
It is to me.
Made in the US, 321SS, and possibly improvements to the tune for plenum and TB to come.
Dundon race headers $3,750 and free shipping group buy, tune;
3600 RPM: +50 wtq +32whp
5000 RPM: +55 wtq, +52whp
5800 RPM: +24 wtq, +26whp
6500 RPM: +30 wtq, +36whp
7500 RPM: +30 wtq, +43whp
Cargraphic race headers $1,980 plus half off shipping ($50?) group buy, tune, filters, plenum, TB;
342 - 316 = 26whp @ 6500
https://rennlist.com/forums/gt4/8822...l#post12683867
__________________
2016 white/black GT4;
https://rennlist.com/forums/gt4/9321...e-journal.html
2008 white/amaretto S8
It is to me.
Made in the US, 321SS, and possibly improvements to the tune for plenum and TB to come.
Dundon race headers $3,750 and free shipping group buy, tune;
3600 RPM: +50 wtq +32whp
5000 RPM: +55 wtq, +52whp
5800 RPM: +24 wtq, +26whp
6500 RPM: +30 wtq, +36whp
7500 RPM: +30 wtq, +43whp
Cargraphic race headers $1,980 plus half off shipping ($50?) group buy, tune, filters, plenum, TB;
342 - 316 = 26whp @ 6500
https://rennlist.com/forums/gt4/8822...l#post12683867
__________________
2016 white/black GT4;
https://rennlist.com/forums/gt4/9321...e-journal.html
2008 white/amaretto S8
08-19-2016, 01:27 PM
#32
Rennlist Member
Comparing only the wheel HP increase for each practically eliminates dynamometer difference.
Last edited by d00d; 12-25-2019 at 06:40 PM.
08-19-2016, 01:33 PM
#33
Race Director
^I understand but I would still like to see them run back to back under same conditions on same dyno.
I am not disputing Dundon's work nor findings - they are impressive and worthy.
I would just love to see their catless headers ran w/o a tune and then Cargraphic ran w/o tune on same dyno and conditions.
I have no skin in the game.
I am not disputing Dundon's work nor findings - they are impressive and worthy.
I would just love to see their catless headers ran w/o a tune and then Cargraphic ran w/o tune on same dyno and conditions.
I have no skin in the game.
08-19-2016, 01:39 PM
#34
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Thread Starter
^I understand but I would still like to see them run back to back under same conditions on same dyno.
I am not disputing Dundon's work nor findings - they are impressive and worthy.
I would just love to see their catless headers ran w/o a tune and then Cargraphic ran w/o tune on same dyno and conditions.
I have no skin in the game.
I am not disputing Dundon's work nor findings - they are impressive and worthy.
I would just love to see their catless headers ran w/o a tune and then Cargraphic ran w/o tune on same dyno and conditions.
I have no skin in the game.
If someone sends us a Cargraphic catless header we will run it on our dyno with no tune, Or once our parts are out feel free to pay another shop to dyno it back to back with a PIWIS in Rolling road mode...
Thought seriously about buying a set...
__________________
Dundon Motorsports
Gig Harbor, WA
253-200-4454
jamie@dundonmotorsports.com
www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
Dundon Motorsports
Gig Harbor, WA
253-200-4454
jamie@dundonmotorsports.com
www.dundonmotorsports.com
Facebook.com/dundonmotorsports
Instagram @dundon_motorsports
08-19-2016, 03:05 PM
#36
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Thread Starter
There's way more at play in our race headers than copy the stock system and leave off the cat...
08-19-2016, 06:22 PM
#38
For those of you on the fence - one thing to consider is that a Cat'd header is going to fail quickly on the track, and is not warrantied if used on the track. So you options, as track rat, are stay OEM or go race headers, and these appear to be the best.
08-19-2016, 06:47 PM
#39
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Thread Starter
The stock pieces are 304 20Ga, like the old Ferrari manifolds and will likely crack and fail in not too many years...
08-19-2016, 10:41 PM
#43
Isn't this pretty thin, even for 321 stainless?
I'm used to seeing 16Ga as standard for street applications, and 18Ga is 20% thinner. How does durability of 321 stainless @ 18Ga compare to that of 308 stainless @ 16Ga? I note that you offer a lifetime structural warranty for the original purchaser, but the academic question remains.
Comparison of 308 vs 321 below.
http://www.burnsstainless.com/stainlesssteel.aspx (see bottom for material properties)
I'm used to seeing 16Ga as standard for street applications, and 18Ga is 20% thinner. How does durability of 321 stainless @ 18Ga compare to that of 308 stainless @ 16Ga? I note that you offer a lifetime structural warranty for the original purchaser, but the academic question remains.
Comparison of 308 vs 321 below.
http://www.burnsstainless.com/stainlesssteel.aspx (see bottom for material properties)
Last edited by belfo; 08-19-2016 at 11:10 PM.
