70mm intake - $12 - with pics

[B-BGTLimited]

That is only a 2.75" pipe, so you won't have as much headroom as the intake suggested in this thread. Nonetheless its a good price.

 

For someone who is planning on staying mostly stock if not stage 1 at the most and maybe a cat back, I would think the 2.75" pipe would be sufficient... just remember how small the inlet on the turbo is no sense in feeding a garden hose with a fire hose you don't really get far.

 

LGTspecB: Could those negative corrections be happening during decel? I know that's a common thing when doing my GM, you'll see a good amount of negative trims and its mainly due to the decel enrichment functions.

[LGTspecB1657615261]

For someone who is planning on staying mostly stock if not stage 1 at the most and maybe a cat back, I would think the 2.75" pipe would be sufficient... just remember how small the inlet on the turbo is no sense in feeding a garden hose with a fire hose you don't really get far.

 

LGTspecB: Could those negative corrections be happening during decel? I know that's a common thing when doing my GM, you'll see a good amount of negative trims and its mainly due to the decel enrichment functions.

 

If you plot corrections vs. RPM you can see that they are clustered around 2200 PRM and 2600 RPM which is where I generally end up after I shift. So, I am thinking it has something to do with shifting? No idea.

[B-BGTLimited]

I would think any correction like that if not under a load area, for example, your instance being right after a shift, Isn't really something you should worry too much about. But that's just my $.02 with the experience I have tuning my other car.

[B-BGTLimited]

I purchased the dreaded "e-bay intake" and I replied in that thread.

[John M]

On the "cheap intake" front, my plastic is still holding up to 90+ degree temps (high 90s this weekend). I'm pulling around 390 g/sec at 20-21 psi. Timing is still 3-4 degrees more conservative than required -- I'll work on it slowly.

 

It's quick enough that my logs show I equal MotorTrend's BMW M5 (v10, 500hp, July 09) acceleration both 45-65 (1.8 sec) and 70-90 (2.9 sec), meaning I should also be trapping ~ 115 mph as it sits.

 

I tie the blown Caddy CTS-V from 45-65 but it's quicker 70-90 by 3 tenths. It traps 117 so I've got a little more to go.

[John M]

3 more months, damn near all 100-degree days, still no problems.

 

I'm still tuning the highest end of the scale but it's slow since I'm working with the IAT comp table at the same time. The car is quick in the cool-ish (65 degrees) nights we've been seeing this week -- enough to surprise a blown 5.0 who was running racegas

[ClimberDHexMods]

John do you have an updated scaling of your MAF?

 

The scaling in the first post appears to flow considerably more than the AEM I have. Rather large discrepancy for almost identical inside diameter. Could have something to do with the injectors... but just wondering if you made big changes.

[LGTspecB1657615261]

John do you have an updated scaling of your MAF?

 

The scaling in the first post appears to flow considerably more than the AEM I have. Rather large discrepancy for almost identical inside diameter. Could have something to do with the injectors... but just wondering if you made big changes.

 

When I get home I will post my MAF scaling. Actually, I am going back to a more stock-like setup so I will be selling this intake. The silicone couplers I bought cost more than everything else... lol.

[John M]

This is what I'm running now. I think there may be a little change in the low-mid range but not a lot.

 

[Table2D]
0.90	0.94	0.98	1.02	1.05	1.09	1.13	1.17	1.21	1.25	1.29	1.33	1.37	1.41	1.48	1.56	1.64	1.72	1.80	1.88	1.95	2.03	2.11	2.19	2.23	2.34	2.42	2.54	2.66	2.77	2.89	3.01	3.12	3.24	3.36	3.48	3.59	3.71	3.83	3.95	4.06	4.18	4.30	4.41	4.49	4.57	4.61	4.65	4.69	4.73	4.80	4.88	4.96	5.00
1.56	1.80	2.05	2.30	2.57	2.88	3.23	3.62	4.05	4.49	5.00	5.67	5.94	6.57	7.95	9.44	10.51	12.24	14.09	16.19	18.53	21.16	24.06	27.24	29.00	34.56	38.65	45.48	52.86	60.84	69.49	77.31	84.62	95.10	106.47	118.85	132.21	146.57	170.01	187.32	199.55	221.09	242.13	291.90	305.74	317.71	320.48	343.43	353.43	363.64	384.64	406.46	429.15	440.85

 

Learning view shows airflow corrections are: +3.9, +2.5, +1.8, and 0.

 

Oh, and I'm running DW850s with an 850 scalar as chosen by my engine builder.

 

From 4.6 volts & up is where I'm working now. It seems to grow leaner at the very top, like at 4.73 volts I'm a half point leaner than the map calls for. I accidentally logged maf grams and not voltage so I'll have to re-log to work on the correction. Some of this may involve the temp correction rather than the scaling.

[ClimberDHexMods]

This is what I'm running now. I think there may be a little change in the low-mid range but not a lot.

 

[Table2D]
0.90	0.94	0.98	1.02	1.05	1.09	1.13	1.17	1.21	1.25	1.29	1.33	1.37	1.41	1.48	1.56	1.64	1.72	1.80	1.88	1.95	2.03	2.11	2.19	2.23	2.34	2.42	2.54	2.66	2.77	2.89	3.01	3.12	3.24	3.36	3.48	3.59	3.71	3.83	3.95	4.06	4.18	4.30	4.41	4.49	4.57	4.61	4.65	4.69	4.73	4.80	4.88	4.96	5.00
1.56	1.80	2.05	2.30	2.57	2.88	3.23	3.62	4.05	4.49	5.00	5.67	5.94	6.57	7.95	9.44	10.51	12.24	14.09	16.19	18.53	21.16	24.06	27.24	29.00	34.56	38.65	45.48	52.86	60.84	69.49	77.31	84.62	95.10	106.47	118.85	132.21	146.57	170.01	187.32	199.55	221.09	242.13	291.90	305.74	317.71	320.48	343.43	353.43	363.64	384.64	406.46	429.15	440.85

 

Learning view shows airflow corrections are: +3.9, +2.5, +1.8, and 0.

 

Oh, and I'm running DW850s with an 850 scalar as chosen by my engine builder.

 

From 4.6 volts & up is where I'm working now. It seems to grow leaner at the very top, like at 4.73 volts I'm a half point leaner than the map calls for. I accidentally logged maf grams and not voltage so I'll have to re-log to work on the correction. Some of this may involve the temp correction rather than the scaling.

 

Wow thanks that's still acceptable, might run this after all...

 

Edit: I'm confused at how the AEM scaling can be so different with the same diameter. Maybe "it's not you it's me" it applicable here. Will measure my AEM again...

[John M]

The numbers are way higher than Cobb's 70mm too -- I can't explain it. For comparison, at 4.88v their intake is 383 g/sec where mine is 406 and I probably need to raise mine a little more.

 

I don't have a high-precision way to measure this intake. I'm just going off the numbers on their site. Either way, it's done everything I could ever hope for when spending $12.